20042232121 has 2 divisors, whose sum is σ = 20042232122. Its totient is φ = 20042232120.

The previous prime is 20042232109. The next prime is 20042232173. The reversal of 20042232121 is 12123224002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18451418896 + 1590813225 = 135836^2 + 39885^2 .

It is a cyclic number.

It is not a de Polignac number, because 20042232121 - 2¹¹ = 20042230073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20042232181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021116060 + 10021116061.

It is an arithmetic number, because the mean of its divisors is an integer number (10021116061).

Almost surely, 2^20042232121 is an apocalyptic number.

It is an amenable number.

20042232121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042232121 is an equidigital number, since it uses as much as digits as its factorization.

20042232121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20042232121 its reverse (12123224002), we get a palindrome (32165456123).

The spelling of 20042232121 in words is "twenty billion, forty-two million, two hundred thirty-two thousand, one hundred twenty-one".