215531313132 has 12 divisors (see below), whose sum is σ = 502906397336. Its totient is φ = 71843771040.

The previous prime is 215531313131. The next prime is 215531313139. The reversal of 215531313132 is 231313135512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 215531313132.

It is not an unprimeable number, because it can be changed into a prime (215531313131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8980471369 + ... + 8980471392.

Almost surely, 2^215531313132 is an apocalyptic number.

It is an amenable number.

215531313132 is an abundant number, since it is smaller than the sum of its proper divisors (287375084204).

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

215531313132 is a wasteful number, since it uses less digits than its factorization.

215531313132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17960942768 (or 17960942766 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

Adding to 215531313132 its reverse (231313135512), we get a palindrome (446844448644).

The spelling of 215531313132 in words is "two hundred fifteen billion, five hundred thirty-one million, three hundred thirteen thousand, one hundred thirty-two".