21221111220200 has 48 divisors (see below), whose sum is σ = 49341788074860. Its totient is φ = 8487979200000.

The previous prime is 21221111220161. The next prime is 21221111220301. The reversal of 21221111220200 is 202211112212.

It can be written as a sum of positive squares in 6 ways, for example, as 1066283716 + 21220044936484 = 32654^2 + 4606522^2 .

It is a super-2 number, since 2×21221111220200² (a number of 27 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, 761300 + ... + 6559100.

Almost surely, 2^{21221111220200} is an apocalyptic number.

21221111220200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221111220200 is an abundant number, since it is smaller than the sum of its proper divisors (28120676854660).

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

21221111220200 is a wasteful number, since it uses less digits than its factorization.

21221111220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5816118 (or 5816109 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221111220200 its reverse (202211112212), we get a palindrome (21423322332412).

The spelling of 21221111220200 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, two hundred".