21334066400 has 72 divisors (see below), whose sum is σ = 54822975480. Its totient is φ = 8084482560.

The previous prime is 21334066399. The next prime is 21334066441. The reversal of 21334066400 is 466043312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 686579 + ... + 716978.

It is an arithmetic number, because the mean of its divisors is an integer number (761430215).

Almost surely, 2^21334066400 is an apocalyptic number.

21334066400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21334066400 is an abundant number, since it is smaller than the sum of its proper divisors (33488909080).

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

21334066400 is a wasteful number, since it uses less digits than its factorization.

21334066400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403596 (or 1403583 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 21334066400 in words is "twenty-one billion, three hundred thirty-four million, sixty-six thousand, four hundred".