122431021 has 4 divisors (see below), whose sum is σ = 122476732. Its totient is φ = 122385312.

The previous prime is 122430989. The next prime is 122431031. The reversal of 122431021 is 120134221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120134221 = 23 ⋅5223227.

It can be written as a sum of positive squares in 2 ways, for example, as 110775625 + 11655396 = 10525^2 + 3414^2 .

It is a cyclic number.

It is not a de Polignac number, because 122431021 - 2⁵ = 122430989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122430986 and 122431004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122431031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18570 + ... + 24283.

It is an arithmetic number, because the mean of its divisors is an integer number (30619183).

Almost surely, 2^122431021 is an apocalyptic number.

It is an amenable number.

122431021 is a deficient number, since it is larger than the sum of its proper divisors (45711).

122431021 is an equidigital number, since it uses as much as digits as its factorization.

122431021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45710.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 122431021 is about 11064.8552182123. The cubic root of 122431021 is about 496.5509575854.

Adding to 122431021 its reverse (120134221), we get a palindrome (242565242).

The spelling of 122431021 in words is "one hundred twenty-two million, four hundred thirty-one thousand, twenty-one".