123130312220 has 24 divisors (see below), whose sum is σ = 258613874064. Its totient is φ = 49244464256.

The previous prime is 123130312199. The next prime is 123130312243. The reversal of 123130312220 is 22213031321.

It is a super-2 number, since 2×123130312220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 123130312192 and 123130312201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346094 + ... + 605013.

It is an arithmetic number, because the mean of its divisors is an integer number (10775578086).

Almost surely, 2^123130312220 is an apocalyptic number.

123130312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123130312220 is an abundant number, since it is smaller than the sum of its proper divisors (135483561844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123130312220 is a wasteful number, since it uses less digits than its factorization.

123130312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957589 (or 957587 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123130312220 its reverse (22213031321), we get a palindrome (145343343541).

The spelling of 123130312220 in words is "one hundred twenty-three billion, one hundred thirty million, three hundred twelve thousand, two hundred twenty".