21104553004 has 6 divisors (see below), whose sum is σ = 36932967764. Its totient is φ = 10552276500.

The previous prime is 21104552971. The next prime is 21104553007. The reversal of 21104553004 is 40035540112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21104553004.

It is not an unprimeable number, because it can be changed into a prime (21104553007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638069122 + ... + 2638069129.

Almost surely, 2^21104553004 is an apocalyptic number.

It is an amenable number.

21104553004 is a deficient number, since it is larger than the sum of its proper divisors (15828414760).

21104553004 is a wasteful number, since it uses less digits than its factorization.

21104553004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276138255 (or 5276138253 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21104553004 in words is "twenty-one billion, one hundred four million, five hundred fifty-three thousand, four".