21140100444 has 24 divisors (see below), whose sum is σ = 50918092288. Its totient is φ = 6819387120.

The previous prime is 21140100361. The next prime is 21140100461. The reversal of 21140100444 is 44400104112.

It is a self number, because there is not a number n which added to its sum of digits gives 21140100444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28413742 + ... + 28414485.

Almost surely, 2^21140100444 is an apocalyptic number.

It is an amenable number.

21140100444 is an abundant number, since it is smaller than the sum of its proper divisors (29777991844).

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

21140100444 is a wasteful number, since it uses less digits than its factorization.

21140100444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56828265 (or 56828263 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21140100444 its reverse (44400104112), we get a palindrome (65540204556).

The spelling of 21140100444 in words is "twenty-one billion, one hundred forty million, one hundred thousand, four hundred forty-four".