123112031021 has 12 divisors (see below), whose sum is σ = 148150299420. Its totient is φ = 101885817600.

The previous prime is 123112030991. The next prime is 123112031051. The reversal of 123112031021 is 120130211321.

It is an interprime number because it is at equal distance from previous prime (123112030991) and next prime (123112031051).

It can be written as a sum of positive squares in 2 ways, for example, as 33867040900 + 89244990121 = 184030^2 + 298739^2 .

It is not a de Polignac number, because 123112031021 - 2¹⁴ = 123112014637 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 (123112031051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43317380 + ... + 43320221.

It is an arithmetic number, because the mean of its divisors is an integer number (12345858285).

Almost surely, 2^123112031021 is an apocalyptic number.

It is an amenable number.

123112031021 is a deficient number, since it is larger than the sum of its proper divisors (25038268399).

123112031021 is an equidigital number, since it uses as much as digits as its factorization.

123112031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86637644 (or 86637637 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 123112031021 its reverse (120130211321), we get a palindrome (243242242342).

The spelling of 123112031021 in words is "one hundred twenty-three billion, one hundred twelve million, thirty-one thousand, twenty-one".