20222122121 has 4 divisors (see below), whose sum is σ = 20222410500. Its totient is φ = 20221833744.

The previous prime is 20222122097. The next prime is 20222122133. The reversal of 20222122121 is 12122122202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11004010000 + 9218112121 = 104900^2 + 96011^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222122121 - 2⁶ = 20222122057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20222122121.

It is not an unprimeable number, because it can be changed into a prime (20222122021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36335 + ... + 204363.

It is an arithmetic number, because the mean of its divisors is an integer number (5055602625).

Almost surely, 2^20222122121 is an apocalyptic number.

It is an amenable number.

20222122121 is a deficient number, since it is larger than the sum of its proper divisors (288379).

20222122121 is a wasteful number, since it uses less digits than its factorization.

20222122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288378.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20222122121 its reverse (12122122202), we get a palindrome (32344244323).

The spelling of 20222122121 in words is "twenty billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".