21634533400 has 48 divisors (see below), whose sum is σ = 50319100800. Its totient is φ = 8650577280.

The previous prime is 21634533377. The next prime is 21634533409. The reversal of 21634533400 is 433543612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634533409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 557014 + ... + 594586.

It is an arithmetic number, because the mean of its divisors is an integer number (1048314600).

Almost surely, 2^21634533400 is an apocalyptic number.

21634533400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21634533400 is an abundant number, since it is smaller than the sum of its proper divisors (28684567400).

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

21634533400 is a wasteful number, since it uses less digits than its factorization.

21634533400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40468 (or 40459 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The spelling of 21634533400 in words is "twenty-one billion, six hundred thirty-four million, five hundred thirty-three thousand, four hundred".