22021220121 has 16 divisors (see below), whose sum is σ = 30077265600. Its totient is φ = 14326627328.

The previous prime is 22021220063. The next prime is 22021220159. The reversal of 22021220121 is 12102212022.

It is not a de Polignac number, because 22021220121 - 2¹⁷ = 22021089049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22021220121.

It is not an unprimeable number, because it can be changed into a prime (22021220321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429816 + ... + 478313.

It is an arithmetic number, because the mean of its divisors is an integer number (1879829100).

Almost surely, 2^22021220121 is an apocalyptic number.

It is an amenable number.

22021220121 is a deficient number, since it is larger than the sum of its proper divisors (8056045479).

22021220121 is a wasteful number, since it uses less digits than its factorization.

22021220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908328.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22021220121 its reverse (12102212022), we get a palindrome (34123432143).

The spelling of 22021220121 in words is "twenty-two billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".