21162310161312 has 96 divisors (see below), whose sum is σ = 56468902412160. Its totient is φ = 6938090864640.

The previous prime is 21162310161277. The next prime is 21162310161313. The reversal of 21162310161312 is 21316101326112.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21162310161312² (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 21162310161312.

It is not an unprimeable number, because it can be changed into a prime (21162310161313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1689889 + ... + 6721632.

It is an arithmetic number, because the mean of its divisors is an integer number (588217733460).

Almost surely, 2^{21162310161312} is an apocalyptic number.

It is an amenable number.

21162310161312 is an abundant number, since it is smaller than the sum of its proper divisors (35306592250848).

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

21162310161312 is a wasteful number, since it uses less digits than its factorization.

21162310161312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8411966 (or 8411958 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

Adding to 21162310161312 its reverse (21316101326112), we get a palindrome (42478411487424).

The spelling of 21162310161312 in words is "twenty-one trillion, one hundred sixty-two billion, three hundred ten million, one hundred sixty-one thousand, three hundred twelve".