21105513013112 has 32 divisors (see below), whose sum is σ = 43411542796800. Its totient is φ = 9539820501600.

The previous prime is 21105513013103. The next prime is 21105513013127. The reversal of 21105513013112 is 21131031550112.

It is a happy number.

It is a congruent number.

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, 669915464 + ... + 669946967.

It is an arithmetic number, because the mean of its divisors is an integer number (1356610712400).

Almost surely, 2^{21105513013112} is an apocalyptic number.

21105513013112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21105513013112 is an abundant number, since it is smaller than the sum of its proper divisors (22306029783688).

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

21105513013112 is a wasteful number, since it uses less digits than its factorization.

21105513013112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339862627 (or 1339862623 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 21105513013112 its reverse (21131031550112), we get a palindrome (42236544563224).

The spelling of 21105513013112 in words is "twenty-one trillion, one hundred five billion, five hundred thirteen million, thirteen thousand, one hundred twelve".