21151420168 has 16 divisors (see below), whose sum is σ = 40029558480. Its totient is φ = 10476871248.

The previous prime is 21151420159. The next prime is 21151420231. The reversal of 21151420168 is 86102415112.

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, 12353946 + ... + 12355657.

It is an arithmetic number, because the mean of its divisors is an integer number (2501847405).

Almost surely, 2^21151420168 is an apocalyptic number.

It is an amenable number.

21151420168 is a deficient number, since it is larger than the sum of its proper divisors (18878138312).

21151420168 is a wasteful number, since it uses less digits than its factorization.

21151420168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24709716 (or 24709712 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 21151420168 in words is "twenty-one billion, one hundred fifty-one million, four hundred twenty thousand, one hundred sixty-eight".