22121011221 has 8 divisors (see below), whose sum is σ = 29495398464. Its totient is φ = 14746982400.

The previous prime is 22121011183. The next prime is 22121011229. The reversal of 22121011221 is 12211012122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22121011221 - 2¹⁴ = 22120994837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22121011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121011229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134421 + ... + 249621.

It is an arithmetic number, because the mean of its divisors is an integer number (3686924808).

Almost surely, 2^22121011221 is an apocalyptic number.

It is an amenable number.

22121011221 is a deficient number, since it is larger than the sum of its proper divisors (7374387243).

22121011221 is a wasteful number, since it uses less digits than its factorization.

22121011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179211.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22121011221 its reverse (12211012122), we get a palindrome (34332023343).

Subtracting from 22121011221 its reverse (12211012122), we obtain a palindrome (9909999099).

The spelling of 22121011221 in words is "twenty-two billion, one hundred twenty-one million, eleven thousand, two hundred twenty-one".