215012412520 has 32 divisors (see below), whose sum is σ = 483838993800. Its totient is φ = 85994108928.

The previous prime is 215012412499. The next prime is 215012412523. The reversal of 215012412520 is 25214210512.

It can be written as a sum of positive squares in 4 ways, for example, as 182956374756 + 32056037764 = 427734^2 + 179042^2 .

It is not an unprimeable number, because it can be changed into a prime (215012412523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14565 + ... + 655924.

Almost surely, 2^215012412520 is an apocalyptic number.

215012412520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215012412520 is an abundant number, since it is smaller than the sum of its proper divisors (268826581280).

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

215012412520 is a wasteful number, since it uses less digits than its factorization.

215012412520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678517 (or 678513 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The spelling of 215012412520 in words is "two hundred fifteen billion, twelve million, four hundred twelve thousand, five hundred twenty".