23919021 has 12 divisors (see below), whose sum is σ = 39485472. Its totient is φ = 13667976.

The previous prime is 23918989. The next prime is 23919029. The reversal of 23919021 is 12091932.

It is not a de Polignac number, because 23919021 - 2⁵ = 23918989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23919029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189771 + ... + 189896.

It is an arithmetic number, because the mean of its divisors is an integer number (3290456).

Almost surely, 2^23919021 is an apocalyptic number.

23919021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23919021 is a deficient number, since it is larger than the sum of its proper divisors (15566451).

23919021 is a wasteful number, since it uses less digits than its factorization.

23919021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379680 (or 379677 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 23919021 is about 4890.7076175130. The cubic root of 23919021 is about 288.1251264737.

The spelling of 23919021 in words is "twenty-three million, nine hundred nineteen thousand, twenty-one".