123013501210421 has 4 divisors (see below), whose sum is σ = 123451271677644. Its totient is φ = 122575730743200.

The previous prime is 123013501210373. The next prime is 123013501210423. The reversal of 123013501210421 is 124012105310321.

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 97718938613521 + 25294562596900 = 9885289^2 + 5029370^2 .

It is a cyclic number.

It is not a de Polignac number, because 123013501210421 - 2⁶ = 123013501210357 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 (123013501210423) 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, 218885233190 + ... + 218885233751.

It is an arithmetic number, because the mean of its divisors is an integer number (30862817919411).

Almost surely, 2^{123013501210421} is an apocalyptic number.

It is an amenable number.

123013501210421 is a deficient number, since it is larger than the sum of its proper divisors (437770467223).

123013501210421 is an equidigital number, since it uses as much as digits as its factorization.

123013501210421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437770467222.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 123013501210421 its reverse (124012105310321), we get a palindrome (247025606520742).

The spelling of 123013501210421 in words is "one hundred twenty-three trillion, thirteen billion, five hundred one million, two hundred ten thousand, four hundred twenty-one".