21383773400 has 72 divisors (see below), whose sum is σ = 54647973660. Its totient is φ = 7775908800.

The previous prime is 21383773379. The next prime is 21383773403. The reversal of 21383773400 is 437738312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21383773403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 417614 + ... + 466013.

Almost surely, 2^21383773400 is an apocalyptic number.

21383773400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21383773400 is an abundant number, since it is smaller than the sum of its proper divisors (33264200260).

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

21383773400 is a wasteful number, since it uses less digits than its factorization.

21383773400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883665 (or 883645 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 21383773400 in words is "twenty-one billion, three hundred eighty-three million, seven hundred seventy-three thousand, four hundred".