21010231200 has 144 divisors (see below), whose sum is σ = 78158122560. Its totient is φ = 4802334720.

The previous prime is 21010231189. The next prime is 21010231211. The reversal of 21010231200 is 213201012.

It is an interprime number because it is at equal distance from previous prime (21010231189) and next prime (21010231211).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 608505 + ... + 642104.

It is an arithmetic number, because the mean of its divisors is an integer number (542764740).

Almost surely, 2^21010231200 is an apocalyptic number.

21010231200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010231200 is an abundant number, since it is smaller than the sum of its proper divisors (57147891360).

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

21010231200 is a wasteful number, since it uses less digits than its factorization.

21010231200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250639 (or 1250626 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21010231200 its reverse (213201012), we get a palindrome (21223432212).

The spelling of 21010231200 in words is "twenty-one billion, ten million, two hundred thirty-one thousand, two hundred".