123031132421021 has 4 divisors (see below), whose sum is σ = 134215780822944. Its totient is φ = 111846484019100.

The previous prime is 123031132421011. The next prime is 123031132421023. The reversal of 123031132421021 is 120124231130321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123031132421021 - 2³⁸ = 122756254514077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123031132421023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5592324200945 + ... + 5592324200966.

It is an arithmetic number, because the mean of its divisors is an integer number (33553945205736).

Almost surely, 2^{123031132421021} is an apocalyptic number.

123031132421021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123031132421021 is a deficient number, since it is larger than the sum of its proper divisors (11184648401923).

123031132421021 is a wasteful number, since it uses less digits than its factorization.

123031132421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11184648401922.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 123031132421021 its reverse (120124231130321), we get a palindrome (243155363551342).

The spelling of 123031132421021 in words is "one hundred twenty-three trillion, thirty-one billion, one hundred thirty-two million, four hundred twenty-one thousand, twenty-one".