120121221137 has 2 divisors, whose sum is σ = 120121221138. Its totient is φ = 120121221136.

The previous prime is 120121221113. The next prime is 120121221139. The reversal of 120121221137 is 731122121021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83084603536 + 37036617601 = 288244^2 + 192449^2 .

It is a cyclic number.

It is not a de Polignac number, because 120121221137 - 2²² = 120117026833 is a prime.

Together with 120121221139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120121221139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060610568 + 60060610569.

It is an arithmetic number, because the mean of its divisors is an integer number (60060610569).

Almost surely, 2^120121221137 is an apocalyptic number.

It is an amenable number.

120121221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

120121221137 is an equidigital number, since it uses as much as digits as its factorization.

120121221137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 120121221137 its reverse (731122121021), we get a palindrome (851243342158).

The spelling of 120121221137 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred thirty-seven".