123011220 has 96 divisors (see below), whose sum is σ = 355170816. Its totient is φ = 31795200.

The previous prime is 123011219. The next prime is 123011221. The reversal of 123011220 is 22110321.

It is an interprime number because it is at equal distance from previous prime (123011219) and next prime (123011221).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 123011196 and 123011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123011221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510300 + ... + 510540.

It is an arithmetic number, because the mean of its divisors is an integer number (3699696).

Almost surely, 2^123011220 is an apocalyptic number.

123011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177585408).

123011220 is an abundant number, since it is smaller than the sum of its proper divisors (232159596).

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

123011220 is a wasteful number, since it uses less digits than its factorization.

123011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 123011220 is about 11091.0423315394. The cubic root of 123011220 is about 497.3341045988.

Adding to 123011220 its reverse (22110321), we get a palindrome (145121541).

The spelling of 123011220 in words is "one hundred twenty-three million, eleven thousand, two hundred twenty".