23140021 has 4 divisors (see below), whose sum is σ = 23278752. Its totient is φ = 23001292.

The previous prime is 23140003. The next prime is 23140037. The reversal of 23140021 is 12004132.

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 23140021 - 2⁵ = 23139989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23139983 and 23140010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23140721) 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, 69115 + ... + 69448.

It is an arithmetic number, because the mean of its divisors is an integer number (5819688).

Almost surely, 2^23140021 is an apocalyptic number.

It is an amenable number.

23140021 is a deficient number, since it is larger than the sum of its proper divisors (138731).

23140021 is a wasteful number, since it uses less digits than its factorization.

23140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138730.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 23140021 is about 4810.4075710900. The cubic root of 23140021 is about 284.9626338618.

Adding to 23140021 its reverse (12004132), we get a palindrome (35144153).

The spelling of 23140021 in words is "twenty-three million, one hundred forty thousand, twenty-one".