21033400432 has 20 divisors (see below), whose sum is σ = 44456960376. Its totient is φ = 9560636480.

The previous prime is 21033400411. The next prime is 21033400481. The reversal of 21033400432 is 23400433012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59753803 + ... + 59754154.

Almost surely, 2^21033400432 is an apocalyptic number.

21033400432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21033400432 is an abundant number, since it is smaller than the sum of its proper divisors (23423559944).

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

21033400432 is a wasteful number, since it uses less digits than its factorization.

21033400432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119507976 (or 119507970 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21033400432 its reverse (23400433012), we get a palindrome (44433833444).

The spelling of 21033400432 in words is "twenty-one billion, thirty-three million, four hundred thousand, four hundred thirty-two".