123023021220 has 72 divisors (see below), whose sum is σ = 407094367680. Its totient is φ = 29823762240.

The previous prime is 123023021201. The next prime is 123023021221. The reversal of 123023021220 is 22120320321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123023021193 and 123023021202.

It is not an unprimeable number, because it can be changed into a prime (123023021221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31064440 + ... + 31068399.

It is an arithmetic number, because the mean of its divisors is an integer number (5654088440).

Almost surely, 2^123023021220 is an apocalyptic number.

123023021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123023021220 is an abundant number, since it is smaller than the sum of its proper divisors (284071346460).

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

123023021220 is a wasteful number, since it uses less digits than its factorization.

123023021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62132865 (or 62132860 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 123023021220 its reverse (22120320321), we get a palindrome (145143341541).

The spelling of 123023021220 in words is "one hundred twenty-three billion, twenty-three million, twenty-one thousand, two hundred twenty".