23213891 has 8 divisors (see below), whose sum is σ = 25427520. Its totient is φ = 21094528.

The previous prime is 23213887. The next prime is 23213899. The reversal of 23213891 is 19831232.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23213891 - 2² = 23213887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23213899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23051 + ... + 24036.

It is an arithmetic number, because the mean of its divisors is an integer number (3178440).

Almost surely, 2^23213891 is an apocalyptic number.

23213891 is a deficient number, since it is larger than the sum of its proper divisors (2213629).

23213891 is a wasteful number, since it uses less digits than its factorization.

23213891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47133.

The product of its digits is 2592, while the sum is 29.

The square root of 23213891 is about 4818.0795966858. The cubic root of 23213891 is about 285.2655409604.

The spelling of 23213891 in words is "twenty-three million, two hundred thirteen thousand, eight hundred ninety-one".