21105311412 has 12 divisors (see below), whose sum is σ = 49245726656. Its totient is φ = 7035103800.

The previous prime is 21105311399. The next prime is 21105311443. The reversal of 21105311412 is 21411350112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879387964 + ... + 879387987.

Almost surely, 2^21105311412 is an apocalyptic number.

It is an amenable number.

21105311412 is an abundant number, since it is smaller than the sum of its proper divisors (28140415244).

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

21105311412 is a wasteful number, since it uses less digits than its factorization.

21105311412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758775958 (or 1758775956 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 21105311412 its reverse (21411350112), we get a palindrome (42516661524).

The spelling of 21105311412 in words is "twenty-one billion, one hundred five million, three hundred eleven thousand, four hundred twelve".