22021121201221 has 32 divisors (see below), whose sum is σ = 23595444633600. Its totient is φ = 20503271589504.

The previous prime is 22021121201197. The next prime is 22021121201239. The reversal of 22021121201221 is 12210212112022.

It is not a de Polignac number, because 22021121201221 - 2¹⁷ = 22021121070149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021121201281) 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, 252831546 + ... + 252918628.

It is an arithmetic number, because the mean of its divisors is an integer number (737357644800).

Almost surely, 2^{22021121201221} is an apocalyptic number.

It is an amenable number.

22021121201221 is a deficient number, since it is larger than the sum of its proper divisors (1574323432379).

22021121201221 is a wasteful number, since it uses less digits than its factorization.

22021121201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88425.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22021121201221 its reverse (12210212112022), we get a palindrome (34231333313243).

The spelling of 22021121201221 in words is "twenty-two trillion, twenty-one billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".