21369232800 has 432 divisors, whose sum is σ = 77800020480. Its totient is φ = 5515776000.

The previous prime is 21369232789. The next prime is 21369232823. The reversal of 21369232800 is 823296312.

It is a super-2 number, since 2×21369232800² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 56383011 + ... + 56383389.

It is an arithmetic number, because the mean of its divisors is an integer number (180092640).

Almost surely, 2^21369232800 is an apocalyptic number.

21369232800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21369232800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38900010240).

21369232800 is an abundant number, since it is smaller than the sum of its proper divisors (56430787680).

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

21369232800 is a wasteful number, since it uses less digits than its factorization.

21369232800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 21369232800 in words is "twenty-one billion, three hundred sixty-nine million, two hundred thirty-two thousand, eight hundred".