23158421 has 8 divisors (see below), whose sum is σ = 27207264. Its totient is φ = 19433520.

The previous prime is 23158409. The next prime is 23158453. The reversal of 23158421 is 12485132.

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 23158421 - 2¹⁰ = 23157397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23158021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80831 + ... + 81116.

It is an arithmetic number, because the mean of its divisors is an integer number (3400908).

Almost surely, 2^23158421 is an apocalyptic number.

It is an amenable number.

23158421 is a deficient number, since it is larger than the sum of its proper divisors (4048843).

23158421 is a wasteful number, since it uses less digits than its factorization.

23158421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161971.

The product of its digits is 1920, while the sum is 26.

The square root of 23158421 is about 4812.3197109087. The cubic root of 23158421 is about 285.0381440687.

Subtracting from 23158421 its reverse (12485132), we obtain a square (10673289 = 3267²).

The spelling of 23158421 in words is "twenty-three million, one hundred fifty-eight thousand, four hundred twenty-one".