23140421 has 4 divisors (see below), whose sum is σ = 23151552. Its totient is φ = 23129292.

The previous prime is 23140409. The next prime is 23140427. The reversal of 23140421 is 12404132.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23140421 - 2⁶ = 23140357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23140421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23140427) 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, 1415 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (5787888).

Almost surely, 2^23140421 is an apocalyptic number.

It is an amenable number.

23140421 is a deficient number, since it is larger than the sum of its proper divisors (11131).

23140421 is an equidigital number, since it uses as much as digits as its factorization.

23140421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 23140421 is about 4810.4491474290. The cubic root of 23140421 is about 284.9642758136.

Adding to 23140421 its reverse (12404132), we get a palindrome (35544553).

The spelling of 23140421 in words is "twenty-three million, one hundred forty thousand, four hundred twenty-one".