21254056116 has 12 divisors (see below), whose sum is σ = 49592797632. Its totient is φ = 7084685368.

The previous prime is 21254056097. The next prime is 21254056129. The reversal of 21254056116 is 61165045212.

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, 885585660 + ... + 885585683.

It is an arithmetic number, because the mean of its divisors is an integer number (4132733136).

Almost surely, 2^21254056116 is an apocalyptic number.

It is an amenable number.

21254056116 is an abundant number, since it is smaller than the sum of its proper divisors (28338741516).

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

21254056116 is a wasteful number, since it uses less digits than its factorization.

21254056116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771171350 (or 1771171348 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 21254056116 in words is "twenty-one billion, two hundred fifty-four million, fifty-six thousand, one hundred sixteen".