123402122520 has 32 divisors (see below), whose sum is σ = 370206367920. Its totient is φ = 32907232640.

The previous prime is 123402122513. The next prime is 123402122573. The reversal of 123402122520 is 25221204321.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514175391 + ... + 514175630.

Almost surely, 2^123402122520 is an apocalyptic number.

123402122520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123402122520 is an abundant number, since it is smaller than the sum of its proper divisors (246804245400).

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

123402122520 is a wasteful number, since it uses less digits than its factorization.

123402122520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028351035 (or 1028351031 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 123402122520 its reverse (25221204321), we get a palindrome (148623326841).

The spelling of 123402122520 in words is "one hundred twenty-three billion, four hundred two million, one hundred twenty-two thousand, five hundred twenty".