22012221121221 has 32 divisors (see below), whose sum is σ = 31554012817152. Its totient is φ = 13615259440640.

The previous prime is 22012221121207. The next prime is 22012221121229. The reversal of 22012221121221 is 12212112221022.

It is a cyclic number.

It is not a de Polignac number, because 22012221121221 - 2⁶ = 22012221121157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012221121229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21998790 + ... + 22977623.

It is an arithmetic number, because the mean of its divisors is an integer number (986062900536).

Almost surely, 2^{22012221121221} is an apocalyptic number.

It is an amenable number.

22012221121221 is a deficient number, since it is larger than the sum of its proper divisors (9541791695931).

22012221121221 is a wasteful number, since it uses less digits than its factorization.

22012221121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44976653.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 22012221121221 its reverse (12212112221022), we get a palindrome (34224333342243).

The spelling of 22012221121221 in words is "twenty-two trillion, twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".