215313021240 has 128 divisors (see below), whose sum is σ = 652440821760. Its totient is φ = 56840845824.

The previous prime is 215313021239. The next prime is 215313021251. The reversal of 215313021240 is 42120313512.

215313021240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215313021240² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 215313021240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7101954 + ... + 7132206.

It is an arithmetic number, because the mean of its divisors is an integer number (5097193920).

Almost surely, 2^215313021240 is an apocalyptic number.

215313021240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215313021240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326220410880).

215313021240 is an abundant number, since it is smaller than the sum of its proper divisors (437127800520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215313021240 is a wasteful number, since it uses less digits than its factorization.

215313021240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30861 (or 30857 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 215313021240 its reverse (42120313512), we get a palindrome (257433334752).

The spelling of 215313021240 in words is "two hundred fifteen billion, three hundred thirteen million, twenty-one thousand, two hundred forty".