123421200542015 has 16 divisors (see below), whose sum is σ = 148955725650816. Its totient is φ = 98171667513600.

The previous prime is 123421200541981. The next prime is 123421200542039. The reversal of 123421200542015 is 510245002124321.

It is not a de Polignac number, because 123421200542015 - 2²⁰ = 123421199493439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97102406 + ... + 98365235.

It is an arithmetic number, because the mean of its divisors is an integer number (9309732853176).

Almost surely, 2^{123421200542015} is an apocalyptic number.

123421200542015 is a deficient number, since it is larger than the sum of its proper divisors (25534525108801).

123421200542015 is a wasteful number, since it uses less digits than its factorization.

123421200542015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195468370.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 123421200542015 its reverse (510245002124321), we get a palindrome (633666202666336).

The spelling of 123421200542015 in words is "one hundred twenty-three trillion, four hundred twenty-one billion, two hundred million, five hundred forty-two thousand, fifteen".