21112231200 has 72 divisors (see below), whose sum is σ = 68720320368. Its totient is φ = 5629927680.

The previous prime is 21112231181. The next prime is 21112231219. The reversal of 21112231200 is 213221112.

It is an interprime number because it is at equal distance from previous prime (21112231181) and next prime (21112231219).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21112231200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4395982 + ... + 4400781.

It is an arithmetic number, because the mean of its divisors is an integer number (954448894).

Almost surely, 2^21112231200 is an apocalyptic number.

21112231200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112231200 is an abundant number, since it is smaller than the sum of its proper divisors (47608089168).

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

21112231200 is a wasteful number, since it uses less digits than its factorization.

21112231200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8796786 (or 8796773 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21112231200 its reverse (213221112), we get a palindrome (21325452312).

The spelling of 21112231200 in words is "twenty-one billion, one hundred twelve million, two hundred thirty-one thousand, two hundred".