21221102221000 has 64 divisors (see below), whose sum is σ = 54171686424960. Its totient is φ = 7716764440000.

The previous prime is 21221102220971. The next prime is 21221102221021. The reversal of 21221102221000 is 12220112212.

It is a happy number.

It is a super-2 number, since 2×21221102221000² (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 15 ways as a sum of consecutive naturals, for example, 964584556 + ... + 964606555.

It is an arithmetic number, because the mean of its divisors is an integer number (846432600390).

Almost surely, 2^{21221102221000} is an apocalyptic number.

21221102221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221102221000 is an abundant number, since it is smaller than the sum of its proper divisors (32950584203960).

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

21221102221000 is a wasteful number, since it uses less digits than its factorization.

21221102221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929191143 (or 1929191129 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221102221000 its reverse (12220112212), we get a palindrome (21233322333212).

The spelling of 21221102221000 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty-one thousand".