21122012200 has 48 divisors (see below), whose sum is σ = 49380081660. Its totient is φ = 8402112000.

The previous prime is 21122012183. The next prime is 21122012227. The reversal of 21122012200 is 221022112.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5651130276 + 15470881924 = 75174^2 + 124382^2 .

It is a super-2 number, since 2×21122012200² (a number of 21 digits) contains 22 as substring.

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, 255541 + ... + 327940.

Almost surely, 2^21122012200 is an apocalyptic number.

21122012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122012200 is an abundant number, since it is smaller than the sum of its proper divisors (28258069460).

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

21122012200 is a wasteful number, since it uses less digits than its factorization.

21122012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583678 (or 583669 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21122012200 its reverse (221022112), we get a palindrome (21343034312).

The spelling of 21122012200 in words is "twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred".