123423516121 has 4 divisors (see below), whose sum is σ = 123424988544. Its totient is φ = 123422043700.

The previous prime is 123423516109. The next prime is 123423516133. The reversal of 123423516121 is 121615324321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121615324321 = 182453 ⋅666557.

It is an interprime number because it is at equal distance from previous prime (123423516109) and next prime (123423516133).

It is a cyclic number.

It is not a de Polignac number, because 123423516121 - 2¹⁵ = 123423483353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123423516421) 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, 602365 + ... + 780826.

It is an arithmetic number, because the mean of its divisors is an integer number (30856247136).

Almost surely, 2^123423516121 is an apocalyptic number.

It is an amenable number.

123423516121 is a deficient number, since it is larger than the sum of its proper divisors (1472423).

123423516121 is an equidigital number, since it uses as much as digits as its factorization.

123423516121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472422.

The product of its digits is 8640, while the sum is 31.

The spelling of 123423516121 in words is "one hundred twenty-three billion, four hundred twenty-three million, five hundred sixteen thousand, one hundred twenty-one".