21254168772 has 48 divisors (see below), whose sum is σ = 55473264000. Its totient is φ = 7037169120.

The previous prime is 21254168743. The next prime is 21254168813. The reversal of 21254168772 is 27786145212.

21254168772 is a `hidden beast` number, since 21 + 2 + 541 + 6 + 87 + 7 + 2 = 666.

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, 644304 + ... + 676487.

It is an arithmetic number, because the mean of its divisors is an integer number (1155693000).

Almost surely, 2^21254168772 is an apocalyptic number.

It is an amenable number.

21254168772 is an abundant number, since it is smaller than the sum of its proper divisors (34219095228).

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

21254168772 is a wasteful number, since it uses less digits than its factorization.

21254168772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320953 (or 1320945 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The spelling of 21254168772 in words is "twenty-one billion, two hundred fifty-four million, one hundred sixty-eight thousand, seven hundred seventy-two".