21312155121312 has 48 divisors (see below), whose sum is σ = 61030262395872. Its totient is φ = 6458228824320.

The previous prime is 21312155121289. The next prime is 21312155121329.

21312155121312 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21312155121312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10090981483 + ... + 10090983594.

It is an arithmetic number, because the mean of its divisors is an integer number (1271463799914).

Almost surely, 2^{21312155121312} is an apocalyptic number.

21312155121312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21312155121312 is an abundant number, since it is smaller than the sum of its proper divisors (39718107274560).

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

21312155121312 is a wasteful number, since it uses less digits than its factorization.

21312155121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20181965101 (or 20181965093 counting only the distinct ones).

The product of its digits is 3600, while the sum is 30.

It can be divided in two parts, 2131215 and 5121312, that added together give a palindrome (7252527).

The spelling of 21312155121312 in words is "twenty-one trillion, three hundred twelve billion, one hundred fifty-five million, one hundred twenty-one thousand, three hundred twelve".