123012242215540 has 72 divisors (see below), whose sum is σ = 277149204732960. Its totient is φ = 45735633650304.

The previous prime is 123012242215517. The next prime is 123012242215573. The reversal of 123012242215540 is 45512242210321.

It is a junction number, because it is equal to n+sod(n) for n = 123012242215496 and 123012242215505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56553874 + ... + 58688713.

It is an arithmetic number, because the mean of its divisors is an integer number (3849294510180).

Almost surely, 2^{123012242215540} is an apocalyptic number.

123012242215540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123012242215540 is an abundant number, since it is smaller than the sum of its proper divisors (154136962517420).

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

123012242215540 is a wasteful number, since it uses less digits than its factorization.

123012242215540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115242721 (or 115242666 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 123012242215540 its reverse (45512242210321), we get a palindrome (168524484425861).

The spelling of 123012242215540 in words is "one hundred twenty-three trillion, twelve billion, two hundred forty-two million, two hundred fifteen thousand, five hundred forty".