23138421 has 4 divisors (see below), whose sum is σ = 30851232. Its totient is φ = 15425612.

The previous prime is 23138419. The next prime is 23138461. The reversal of 23138421 is 12483132.

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.

It is a cyclic number.

It is not a de Polignac number, because 23138421 - 2¹ = 23138419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23138391 and 23138400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23138461) 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, 3856401 + ... + 3856406.

It is an arithmetic number, because the mean of its divisors is an integer number (7712808).

Almost surely, 2^23138421 is an apocalyptic number.

It is an amenable number.

23138421 is a deficient number, since it is larger than the sum of its proper divisors (7712811).

23138421 is an equidigital number, since it uses as much as digits as its factorization.

23138421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7712810.

The product of its digits is 1152, while the sum is 24.

The square root of 23138421 is about 4810.2412621406. The cubic root of 23138421 is about 284.9560658654.

The spelling of 23138421 in words is "twenty-three million, one hundred thirty-eight thousand, four hundred twenty-one".