21036099444 has 12 divisors (see below), whose sum is σ = 49084232064. Its totient is φ = 7012033144.

The previous prime is 21036099433. The next prime is 21036099457. The reversal of 21036099444 is 44499063012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21036099396 and 21036099405.

It is a congruent number.

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, 876504132 + ... + 876504155.

It is an arithmetic number, because the mean of its divisors is an integer number (4090352672).

Almost surely, 2^21036099444 is an apocalyptic number.

It is an amenable number.

21036099444 is an abundant number, since it is smaller than the sum of its proper divisors (28048132620).

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

21036099444 is a wasteful number, since it uses less digits than its factorization.

21036099444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753008294 (or 1753008292 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 21036099444 in words is "twenty-one billion, thirty-six million, ninety-nine thousand, four hundred forty-four".