22012122121 has 32 divisors (see below), whose sum is σ = 25975123200. Its totient is φ = 18430156800.

The previous prime is 22012122113. The next prime is 22012122157. The reversal of 22012122121 is 12122121022.

It is a happy number.

It is not a de Polignac number, because 22012122121 - 2³ = 22012122113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012122095 and 22012122104.

It is not an unprimeable number, because it can be changed into a prime (22012122161) 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, 2265145 + ... + 2274841.

It is an arithmetic number, because the mean of its divisors is an integer number (811722600).

Almost surely, 2^22012122121 is an apocalyptic number.

It is an amenable number.

22012122121 is a deficient number, since it is larger than the sum of its proper divisors (3963001079).

22012122121 is a wasteful number, since it uses less digits than its factorization.

22012122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9985.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22012122121 its reverse (12122121022), we get a palindrome (34134243143).

It can be divided in two parts, 220121 and 22121, that added together give a palindrome (242242).

The spelling of 22012122121 in words is "twenty-two billion, twelve million, one hundred twenty-two thousand, one hundred twenty-one".