21133132400 has 30 divisors (see below), whose sum is σ = 50772351552. Its totient is φ = 8453252800.

The previous prime is 21133132333. The next prime is 21133132403. The reversal of 21133132400 is 423133112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133132403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26416016 + ... + 26416815.

Almost surely, 2^21133132400 is an apocalyptic number.

21133132400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21133132400 is an abundant number, since it is smaller than the sum of its proper divisors (29639219152).

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

21133132400 is a wasteful number, since it uses less digits than its factorization.

21133132400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52832849 (or 52832838 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21133132400 its reverse (423133112), we get a palindrome (21556265512).

The spelling of 21133132400 in words is "twenty-one billion, one hundred thirty-three million, one hundred thirty-two thousand, four hundred".