21143021200 has 60 divisors (see below), whose sum is σ = 58052703040. Its totient is φ = 7249034880.

The previous prime is 21143021189. The next prime is 21143021231. The reversal of 21143021200 is 212034112.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 3772740 + ... + 3778339.

Almost surely, 2^21143021200 is an apocalyptic number.

21143021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143021200 is an abundant number, since it is smaller than the sum of its proper divisors (36909681840).

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

21143021200 is a wasteful number, since it uses less digits than its factorization.

21143021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7551104 (or 7551093 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21143021200 its reverse (212034112), we get a palindrome (21355055312).

The spelling of 21143021200 in words is "twenty-one billion, one hundred forty-three million, twenty-one thousand, two hundred".