21054408576 has 64 divisors (see below), whose sum is σ = 56981031120. Its totient is φ = 6885711872.

The previous prime is 21054408569. The next prime is 21054408577. The reversal of 21054408576 is 67580445012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054408577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496905 + ... + 537608.

Almost surely, 2^21054408576 is an apocalyptic number.

It is an amenable number.

21054408576 is an abundant number, since it is smaller than the sum of its proper divisors (35926622544).

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

21054408576 is a wasteful number, since it uses less digits than its factorization.

21054408576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034583 (or 1034571 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 21054408576 in words is "twenty-one billion, fifty-four million, four hundred eight thousand, five hundred seventy-six".