123012240124251 has 4 divisors (see below), whose sum is σ = 164016320165672. Its totient is φ = 82008160082832.

The previous prime is 123012240124247. The next prime is 123012240124271. The reversal of 123012240124251 is 152421042210321.

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

It is not a de Polignac number, because 123012240124251 - 2² = 123012240124247 is a prime.

It is a super-2 number, since 2×123012240124251² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123012240124271) 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, 20502040020706 + ... + 20502040020711.

It is an arithmetic number, because the mean of its divisors is an integer number (41004080041418).

Almost surely, 2^{123012240124251} is an apocalyptic number.

123012240124251 is a deficient number, since it is larger than the sum of its proper divisors (41004080041421).

123012240124251 is an equidigital number, since it uses as much as digits as its factorization.

123012240124251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41004080041420.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 123012240124251 its reverse (152421042210321), we get a palindrome (275433282334572).

The spelling of 123012240124251 in words is "one hundred twenty-three trillion, twelve billion, two hundred forty million, one hundred twenty-four thousand, two hundred fifty-one".