21126465054 has 24 divisors (see below), whose sum is σ = 47011144440. Its totient is φ = 6851826288.

The previous prime is 21126465049. The next prime is 21126465071. The reversal of 21126465054 is 45056462112.

21126465054 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 646 + 5 + 0 + 5 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15860044 + ... + 15861375.

It is an arithmetic number, because the mean of its divisors is an integer number (1958797685).

Almost surely, 2^21126465054 is an apocalyptic number.

21126465054 is an abundant number, since it is smaller than the sum of its proper divisors (25884679386).

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

21126465054 is a wasteful number, since it uses less digits than its factorization.

21126465054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31721464 (or 31721461 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 21126465054 in words is "twenty-one billion, one hundred twenty-six million, four hundred sixty-five thousand, fifty-four".