21320021023200 has 216 divisors, whose sum is σ = 76928090927688. Its totient is φ = 5553121674240.

The previous prime is 21320021023151. The next prime is 21320021023229. The reversal of 21320021023200 is 232012002312.

21320021023200 is a `hidden beast` number, since 2 + 1 + 320 + 0 + 21 + 0 + 2 + 320 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 34121959 + ... + 34741158.

Almost surely, 2^{21320021023200} is an apocalyptic number.

21320021023200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320021023200 is an abundant number, since it is smaller than the sum of its proper divisors (55608069904488).

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

21320021023200 is a wasteful number, since it uses less digits than its factorization.

21320021023200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68863186 (or 68863170 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21320021023200 its reverse (232012002312), we get a palindrome (21552033025512).

The spelling of 21320021023200 in words is "twenty-one trillion, three hundred twenty billion, twenty-one million, twenty-three thousand, two hundred".