20220121129 has 16 divisors (see below), whose sum is σ = 22039451280. Its totient is φ = 18439188480.

The previous prime is 20220121091. The next prime is 20220121133. The reversal of 20220121129 is 92112102202.

It can be written as a sum of positive squares in 8 ways, for example, as 521437225 + 19698683904 = 22835^2 + 140352^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220121129 - 2¹⁹ = 20219596841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20220121729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703419 + ... + 731599.

It is an arithmetic number, because the mean of its divisors is an integer number (1377465705).

Almost surely, 2^20220121129 is an apocalyptic number.

It is an amenable number.

20220121129 is a deficient number, since it is larger than the sum of its proper divisors (1819330151).

20220121129 is a wasteful number, since it uses less digits than its factorization.

20220121129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28860.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20220121129 in words is "twenty billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-nine".