21122211200 has 48 divisors (see below), whose sum is σ = 52178470260. Its totient is φ = 8448883200.

The previous prime is 21122211191. The next prime is 21122211217. The reversal of 21122211200 is 211222112.

It is a super-2 number, since 2×21122211200² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3297146 + ... + 3303545.

Almost surely, 2^21122211200 is an apocalyptic number.

21122211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122211200 is an abundant number, since it is smaller than the sum of its proper divisors (31056259060).

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

21122211200 is an equidigital number, since it uses as much as digits as its factorization.

21122211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6600715 (or 6600698 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21122211200 its reverse (211222112), we get a palindrome (21333433312).

21122211200 divided by its reverse (211222112) gives a square (100 = 10²).

The spelling of 21122211200 in words is "twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, two hundred".