21320442200 has 48 divisors (see below), whose sum is σ = 51169076160. Its totient is φ = 8253072000.

The previous prime is 21320442197. The next prime is 21320442239. The reversal of 21320442200 is 224402312.

It is a super-2 number, since 2×21320442200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 1713191 + ... + 1725590.

It is an arithmetic number, because the mean of its divisors is an integer number (1066022420).

Almost surely, 2^21320442200 is an apocalyptic number.

21320442200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320442200 is an abundant number, since it is smaller than the sum of its proper divisors (29848633960).

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

21320442200 is a wasteful number, since it uses less digits than its factorization.

21320442200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438828 (or 3438819 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21320442200 its reverse (224402312), we get a palindrome (21544844512).

The spelling of 21320442200 in words is "twenty-one billion, three hundred twenty million, four hundred forty-two thousand, two hundred".