21426135768 has 64 divisors (see below), whose sum is σ = 59697052800. Its totient is φ = 7120444320.

The previous prime is 21426135733. The next prime is 21426135779. The reversal of 21426135768 is 86753162412.

21426135768 is a `hidden beast` number, since 2 + 14 + 2 + 61 + 3 + 576 + 8 = 666.

It is a congruent number.

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, 78346 + ... + 221337.

It is an arithmetic number, because the mean of its divisors is an integer number (932766450).

Almost surely, 2^21426135768 is an apocalyptic number.

It is an amenable number.

21426135768 is an abundant number, since it is smaller than the sum of its proper divisors (38270917032).

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

21426135768 is a wasteful number, since it uses less digits than its factorization.

21426135768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300029 (or 300019 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 21426135768 in words is "twenty-one billion, four hundred twenty-six million, one hundred thirty-five thousand, seven hundred sixty-eight".