21126466044 has 18 divisors (see below), whose sum is σ = 53403011480. Its totient is φ = 7042155336.

The previous prime is 21126466027. The next prime is 21126466057. The reversal of 21126466044 is 44066462112.

21126466044 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 6 + 46 + 604 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 586846279 = 21126466044 / (2 + 1 + 1 + 2 + 6 + 4 + 6 + 6 + 0 + 4 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293423104 + ... + 293423175.

Almost surely, 2^21126466044 is an apocalyptic number.

It is an amenable number.

21126466044 is an abundant number, since it is smaller than the sum of its proper divisors (32276545436).

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

21126466044 is a wasteful number, since it uses less digits than its factorization.

21126466044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586846289 (or 586846284 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 21126466044 in words is "twenty-one billion, one hundred twenty-six million, four hundred sixty-six thousand, forty-four".