21154045712 has 10 divisors (see below), whose sum is σ = 40985963598. Its totient is φ = 10577022848.

The previous prime is 21154045687. The next prime is 21154045721. The reversal of 21154045712 is 21754045112.

It can be written as a sum of positive squares in only one way, i.e., 20131069456 + 1022976256 = 141884^2 + 31984^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661063913 + ... + 661063944.

Almost surely, 2^21154045712 is an apocalyptic number.

It is an amenable number.

21154045712 is a deficient number, since it is larger than the sum of its proper divisors (19831917886).

21154045712 is a wasteful number, since it uses less digits than its factorization.

21154045712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322127865 (or 1322127859 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The spelling of 21154045712 in words is "twenty-one billion, one hundred fifty-four million, forty-five thousand, seven hundred twelve".