21274224400 has 120 divisors (see below), whose sum is σ = 60047031744. Its totient is φ = 7140979200.

The previous prime is 21274224359. The next prime is 21274224407. The reversal of 21274224400 is 442247212.

It is not an unprimeable number, because it can be changed into a prime (21274224407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128764 + ... + 243163.

Almost surely, 2^21274224400 is an apocalyptic number.

21274224400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21274224400 is an abundant number, since it is smaller than the sum of its proper divisors (38772807344).

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

21274224400 is a wasteful number, since it uses less digits than its factorization.

21274224400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371969 (or 371958 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 28.

The spelling of 21274224400 in words is "twenty-one billion, two hundred seventy-four million, two hundred twenty-four thousand, four hundred".