16121923 has 4 divisors (see below), whose sum is σ = 16281648. Its totient is φ = 15962200.

The previous prime is 16121921. The next prime is 16121971. The reversal of 16121923 is 32912161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32912161 = 19 ⋅1732219.

It is a cyclic number.

It is not a de Polignac number, because 16121923 - 2¹ = 16121921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16121921) 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, 79711 + ... + 79912.

It is an arithmetic number, because the mean of its divisors is an integer number (4070412).

Almost surely, 2^16121923 is an apocalyptic number.

16121923 is a deficient number, since it is larger than the sum of its proper divisors (159725).

16121923 is a wasteful number, since it uses less digits than its factorization.

16121923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159724.

The product of its digits is 648, while the sum is 25.

The square root of 16121923 is about 4015.2114514680. The cubic root of 16121923 is about 252.6226466879.

The spelling of 16121923 in words is "sixteen million, one hundred twenty-one thousand, nine hundred twenty-three".