123030021031 has 4 divisors (see below), whose sum is σ = 123169670064. Its totient is φ = 122890372000.

The previous prime is 123030020989. The next prime is 123030021041. The reversal of 123030021031 is 130120030321.

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 123030021031 - 2⁷ = 123030020903 is a prime.

It is a super-2 number, since 2×123030021031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123030020996 and 123030021014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123030021041) 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, 69823195 + ... + 69824956.

It is an arithmetic number, because the mean of its divisors is an integer number (30792417516).

Almost surely, 2^123030021031 is an apocalyptic number.

123030021031 is a deficient number, since it is larger than the sum of its proper divisors (139649033).

123030021031 is an equidigital number, since it uses as much as digits as its factorization.

123030021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139649032.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 123030021031 its reverse (130120030321), we get a palindrome (253150051352).

The spelling of 123030021031 in words is "one hundred twenty-three billion, thirty million, twenty-one thousand, thirty-one".