21221000012200 has 24 divisors (see below), whose sum is σ = 49338825028830. Its totient is φ = 8488400004800.

The previous prime is 21221000012141. The next prime is 21221000012323. The reversal of 21221000012200 is 221000012212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17238987744196 + 3982012268004 = 4151986^2 + 1995498^2 .

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, 53052499831 + ... + 53052500230.

Almost surely, 2^{21221000012200} is an apocalyptic number.

21221000012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221000012200 is an abundant number, since it is smaller than the sum of its proper divisors (28117825016630).

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

21221000012200 is a wasteful number, since it uses less digits than its factorization.

21221000012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106105000077 (or 106105000068 counting only the distinct ones).

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

Adding to 21221000012200 its reverse (221000012212), we get a palindrome (21442000024412).

The spelling of 21221000012200 in words is "twenty-one trillion, two hundred twenty-one billion, twelve thousand, two hundred".