123421151411521 has 4 divisors (see below), whose sum is σ = 123426292484032. Its totient is φ = 123416010339012.

The previous prime is 123421151411473. The next prime is 123421151411533. The reversal of 123421151411521 is 125114151124321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123421151411521 - 2⁹ = 123421151411009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123421151411561) 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, 2570500245 + ... + 2570548258.

It is an arithmetic number, because the mean of its divisors is an integer number (30856573121008).

Almost surely, 2^{123421151411521} is an apocalyptic number.

It is an amenable number.

123421151411521 is a deficient number, since it is larger than the sum of its proper divisors (5141072511).

123421151411521 is an equidigital number, since it uses as much as digits as its factorization.

123421151411521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141072510.

The product of its digits is 9600, while the sum is 34.

The spelling of 123421151411521 in words is "one hundred twenty-three trillion, four hundred twenty-one billion, one hundred fifty-one million, four hundred eleven thousand, five hundred twenty-one".