123120020031 has 4 divisors (see below), whose sum is σ = 164160026712. Its totient is φ = 82080013352.

The previous prime is 123120020003. The next prime is 123120020053. The reversal of 123120020031 is 130020021321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123120020031 - 2²² = 123115825727 is a prime.

It is a super-2 number, since 2×123120020031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123120025031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20520003336 + ... + 20520003341.

It is an arithmetic number, because the mean of its divisors is an integer number (41040006678).

Almost surely, 2^123120020031 is an apocalyptic number.

123120020031 is a deficient number, since it is larger than the sum of its proper divisors (41040006681).

123120020031 is an equidigital number, since it uses as much as digits as its factorization.

123120020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41040006680.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 123120020031 its reverse (130020021321), we get a palindrome (253140041352).

The spelling of 123120020031 in words is "one hundred twenty-three billion, one hundred twenty million, twenty thousand, thirty-one".