215245212420 has 96 divisors (see below), whose sum is σ = 689690808576. Its totient is φ = 49134182400.

The previous prime is 215245212383. The next prime is 215245212463. The reversal of 215245212420 is 24212542512.

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

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, 17101 + ... + 656340.

It is an arithmetic number, because the mean of its divisors is an integer number (7184279256).

Almost surely, 2^215245212420 is an apocalyptic number.

215245212420 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 215245212420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344845404288).

215245212420 is an abundant number, since it is smaller than the sum of its proper divisors (474445596156).

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

215245212420 is a wasteful number, since it uses less digits than its factorization.

215245212420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674221 (or 674219 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 215245212420 its reverse (24212542512), we get a palindrome (239457754932).

The spelling of 215245212420 in words is "two hundred fifteen billion, two hundred forty-five million, two hundred twelve thousand, four hundred twenty".