23120021 has 4 divisors (see below), whose sum is σ = 23132544. Its totient is φ = 23107500.

The previous prime is 23119973. The next prime is 23120029. The reversal of 23120021 is 12002132.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-23120021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23119984 and 23120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23120029) 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, 2885 + ... + 7386.

It is an arithmetic number, because the mean of its divisors is an integer number (5783136).

Almost surely, 2^23120021 is an apocalyptic number.

It is an amenable number.

23120021 is a deficient number, since it is larger than the sum of its proper divisors (12523).

23120021 is a wasteful number, since it uses less digits than its factorization.

23120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12522.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 23120021 is about 4808.3282957801. The cubic root of 23120021 is about 284.8805121353.

Adding to 23120021 its reverse (12002132), we get a palindrome (35122153).

The spelling of 23120021 in words is "twenty-three million, one hundred twenty thousand, twenty-one".