21221033222120 has 32 divisors (see below), whose sum is σ = 49393784226600. Its totient is φ = 8195709381888.

The previous prime is 21221033222107. The next prime is 21221033222141. The reversal of 21221033222120 is 2122233012212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10441933034404 + 10779100187716 = 3231398^2 + 3283154^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9146995919 + ... + 9146998238.

Almost surely, 2^{21221033222120} is an apocalyptic number.

21221033222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221033222120 is an abundant number, since it is smaller than the sum of its proper divisors (28172751004480).

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

21221033222120 is a wasteful number, since it uses less digits than its factorization.

21221033222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18293994197 (or 18293994193 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21221033222120 its reverse (2122233012212), we get a palindrome (23343266234332).

The spelling of 21221033222120 in words is "twenty-one trillion, two hundred twenty-one billion, thirty-three million, two hundred twenty-two thousand, one hundred twenty".