122131021 has 2 divisors, whose sum is σ = 122131022. Its totient is φ = 122131020.

The previous prime is 122131019. The next prime is 122131039. The reversal of 122131021 is 120131221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120890025 + 1240996 = 10995^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 122131021 - 2¹ = 122131019 is a prime.

Together with 122131019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 122130992 and 122131010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122131091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61065510 + 61065511.

It is an arithmetic number, because the mean of its divisors is an integer number (61065511).

Almost surely, 2^122131021 is an apocalyptic number.

It is an amenable number.

122131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

122131021 is an equidigital number, since it uses as much as digits as its factorization.

122131021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 122131021 is about 11051.2904676332. The cubic root of 122131021 is about 496.1450497668.

Adding to 122131021 its reverse (120131221), we get a palindrome (242262242).

The spelling of 122131021 in words is "one hundred twenty-two million, one hundred thirty-one thousand, twenty-one".