21221120202200 has 24 divisors (see below), whose sum is σ = 49339104470580. Its totient is φ = 8488448080800.

The previous prime is 21221120202181. The next prime is 21221120202211. The reversal of 21221120202200 is 220202112212.

It is a happy number.

It is a congruent number.

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, 53052800306 + ... + 53052800705.

Almost surely, 2^{21221120202200} is an apocalyptic number.

21221120202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221120202200 is an abundant number, since it is smaller than the sum of its proper divisors (28117984268380).

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

21221120202200 is a wasteful number, since it uses less digits than its factorization.

21221120202200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106105601027 (or 106105601018 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21221120202200 its reverse (220202112212), we get a palindrome (21441322314412).

The spelling of 21221120202200 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred two thousand, two hundred".