21126054132 has 36 divisors (see below), whose sum is σ = 54845270116. Its totient is φ = 6851692800.

The previous prime is 21126054121. The next prime is 21126054137. The reversal of 21126054132 is 23145062112.

21126054132 is a `hidden beast` number, since 2 + 1 + 12 + 605 + 41 + 3 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19386663696 + 1739390436 = 139236^2 + 41706^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21126054096 and 21126054105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126054137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7928869 + ... + 7931532.

Almost surely, 2^21126054132 is an apocalyptic number.

It is an amenable number.

21126054132 is an abundant number, since it is smaller than the sum of its proper divisors (33719215984).

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

21126054132 is a wasteful number, since it uses less digits than its factorization.

21126054132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15860448 (or 15860443 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 21126054132 in words is "twenty-one billion, one hundred twenty-six million, fifty-four thousand, one hundred thirty-two".