123012242215501 has 4 divisors (see below), whose sum is σ = 123013201959900. Its totient is φ = 123011282471104.

The previous prime is 123012242215493. The next prime is 123012242215517. The reversal of 123012242215501 is 105512242210321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78570673280100 + 44441568935401 = 8864010^2 + 6666451^2 .

It is a cyclic number.

It is not a de Polignac number, because 123012242215501 - 2³ = 123012242215493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123012242218501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479679916 + ... + 479936293.

It is an arithmetic number, because the mean of its divisors is an integer number (30753300489975).

Almost surely, 2^{123012242215501} is an apocalyptic number.

It is an amenable number.

123012242215501 is a deficient number, since it is larger than the sum of its proper divisors (959744399).

123012242215501 is an equidigital number, since it uses as much as digits as its factorization.

123012242215501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959744398.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 123012242215501 its reverse (105512242210321), we get a palindrome (228524484425822).

The spelling of 123012242215501 in words is "one hundred twenty-three trillion, twelve billion, two hundred forty-two million, two hundred fifteen thousand, five hundred one".