21000222012200 has 24 divisors (see below), whose sum is σ = 48825516178830. Its totient is φ = 8400088804800.

The previous prime is 21000222012173. The next prime is 21000222012223. The reversal of 21000222012200 is 221022200012.

It can be written as a sum of positive squares in 3 ways, for example, as 20535924228964 + 464297783236 = 4531658^2 + 681394^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52500554831 + ... + 52500555230.

Almost surely, 2^{21000222012200} is an apocalyptic number.

21000222012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000222012200 is an abundant number, since it is smaller than the sum of its proper divisors (27825294166630).

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

21000222012200 is a wasteful number, since it uses less digits than its factorization.

21000222012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105001110077 (or 105001110068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000222012200 its reverse (221022200012), we get a palindrome (21221244212212).

The spelling of 21000222012200 in words is "twenty-one trillion, two hundred twenty-two million, twelve thousand, two hundred".