123105034022521 has 4 divisors (see below), whose sum is σ = 123105274707700. Its totient is φ = 123104793337344.

The previous prime is 123105034022497. The next prime is 123105034022533. The reversal of 123105034022521 is 125220430501321.

It is a happy number.

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 50971674908025 + 72133359114496 = 7139445^2 + 8493136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123105034022521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123105034029521) 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, 119573736 + ... + 120598873.

It is an arithmetic number, because the mean of its divisors is an integer number (30776318676925).

Almost surely, 2^{123105034022521} is an apocalyptic number.

It is an amenable number.

123105034022521 is a deficient number, since it is larger than the sum of its proper divisors (240685179).

123105034022521 is an equidigital number, since it uses as much as digits as its factorization.

123105034022521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240685178.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 123105034022521 its reverse (125220430501321), we get a palindrome (248325464523842).

The spelling of 123105034022521 in words is "one hundred twenty-three trillion, one hundred five billion, thirty-four million, twenty-two thousand, five hundred twenty-one".