122142040021 has 2 divisors, whose sum is σ = 122142040022. Its totient is φ = 122142040020.

The previous prime is 122142040019. The next prime is 122142040043. The reversal of 122142040021 is 120040241221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111679614225 + 10462425796 = 334185^2 + 102286^2 .

It is a cyclic number.

It is not a de Polignac number, because 122142040021 - 2¹ = 122142040019 is a prime.

Together with 122142040019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122142040001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61071020010 + 61071020011.

It is an arithmetic number, because the mean of its divisors is an integer number (61071020011).

Almost surely, 2^122142040021 is an apocalyptic number.

It is an amenable number.

122142040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

122142040021 is an equidigital number, since it uses as much as digits as its factorization.

122142040021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 122142040021 its reverse (120040241221), we get a palindrome (242182281242).

The spelling of 122142040021 in words is "one hundred twenty-two billion, one hundred forty-two million, forty thousand, twenty-one".