215435121240 has 128 divisors (see below), whose sum is σ = 669565624320. Its totient is φ = 55395187200.

The previous prime is 215435121217. The next prime is 215435121283. The reversal of 215435121240 is 42121534512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 215435121198 and 215435121207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 925905 + ... + 1134975.

It is an arithmetic number, because the mean of its divisors is an integer number (5230981440).

Almost surely, 2^215435121240 is an apocalyptic number.

215435121240 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 215435121240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334782812160).

215435121240 is an abundant number, since it is smaller than the sum of its proper divisors (454130503080).

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

215435121240 is a wasteful number, since it uses less digits than its factorization.

215435121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209393 (or 209389 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 215435121240 its reverse (42121534512), we get a palindrome (257556655752).

The spelling of 215435121240 in words is "two hundred fifteen billion, four hundred thirty-five million, one hundred twenty-one thousand, two hundred forty".