21123031202300 has 72 divisors (see below), whose sum is σ = 47418229955712. Its totient is φ = 8158919904000.

The previous prime is 21123031202297. The next prime is 21123031202309. The reversal of 21123031202300 is 320213032112.

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 (21123031202309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5961227 + ... + 8819426.

Almost surely, 2^{21123031202300} is an apocalyptic number.

21123031202300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123031202300 is an abundant number, since it is smaller than the sum of its proper divisors (26295198753412).

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

21123031202300 is a wasteful number, since it uses less digits than its factorization.

21123031202300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14781159 (or 14781152 counting only the distinct ones).

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

Adding to 21123031202300 its reverse (320213032112), we get a palindrome (21443244234412).

The spelling of 21123031202300 in words is "twenty-one trillion, one hundred twenty-three billion, thirty-one million, two hundred two thousand, three hundred".