21163132021105 has 16 divisors (see below), whose sum is σ = 25665773894928. Its totient is φ = 16750738080000.

The previous prime is 21163132021063. The next prime is 21163132021123. The reversal of 21163132021105 is 50112023136112.

It can be written as a sum of positive squares in 8 ways, for example, as 959608323216 + 20203523697889 = 979596^2 + 4494833^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21163132021105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14475366 + ... + 15870175.

It is an arithmetic number, because the mean of its divisors is an integer number (1604110868433).

Almost surely, 2^{21163132021105} is an apocalyptic number.

It is an amenable number.

21163132021105 is a deficient number, since it is larger than the sum of its proper divisors (4502641873823).

21163132021105 is a wasteful number, since it uses less digits than its factorization.

21163132021105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347028.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 21163132021105 its reverse (50112023136112), we get a palindrome (71275155157217).

The spelling of 21163132021105 in words is "twenty-one trillion, one hundred sixty-three billion, one hundred thirty-two million, twenty-one thousand, one hundred five".