15312120023532 has 12 divisors (see below), whose sum is σ = 35728280054936. Its totient is φ = 5104040007840.

The previous prime is 15312120023467. The next prime is 15312120023539. The reversal of 15312120023532 is 23532002121351.

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

It is a super-2 number, since 2×15312120023532² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15312120023532.

It is not an unprimeable number, because it can be changed into a prime (15312120023539) 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, 638005000969 + ... + 638005000992.

Almost surely, 2^{15312120023532} is an apocalyptic number.

15312120023532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15312120023532 is an abundant number, since it is smaller than the sum of its proper divisors (20416160031404).

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

15312120023532 is a wasteful number, since it uses less digits than its factorization.

15312120023532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276010001968 (or 1276010001966 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 15312120023532 its reverse (23532002121351), we get a palindrome (38844122144883).

The spelling of 15312120023532 in words is "fifteen trillion, three hundred twelve billion, one hundred twenty million, twenty-three thousand, five hundred thirty-two".