21200022000 has 160 divisors (see below), whose sum is σ = 75943383360. Its totient is φ = 5653324800.

The previous prime is 21200021993. The next prime is 21200022007. The reversal of 21200022000 is 22000212.

It is an interprime number because it is at equal distance from previous prime (21200021993) and next prime (21200022007).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200022007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142297 + ... + 250296.

It is an arithmetic number, because the mean of its divisors is an integer number (474646146).

Almost surely, 2^21200022000 is an apocalyptic number.

21200022000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200022000 is an abundant number, since it is smaller than the sum of its proper divisors (54743361360).

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

21200022000 is a wasteful number, since it uses less digits than its factorization.

21200022000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392625 (or 392603 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 21200022000 its reverse (22000212), we get a palindrome (21222022212).

The spelling of 21200022000 in words is "twenty-one billion, two hundred million, twenty-two thousand".