20012121137 has 2 divisors, whose sum is σ = 20012121138. Its totient is φ = 20012121136.

The previous prime is 20012121109. The next prime is 20012121161. The reversal of 20012121137 is 73112121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15959016241 + 4053104896 = 126329^2 + 63664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012121137 - 2⁸ = 20012120881 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012121167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006060568 + 10006060569.

It is an arithmetic number, because the mean of its divisors is an integer number (10006060569).

Almost surely, 2^20012121137 is an apocalyptic number.

It is an amenable number.

20012121137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012121137 is an equidigital number, since it uses as much as digits as its factorization.

20012121137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 20012121137 its reverse (73112121002), we get a palindrome (93124242139).

The spelling of 20012121137 in words is "twenty billion, twelve million, one hundred twenty-one thousand, one hundred thirty-seven".