23021021 has 4 divisors (see below), whose sum is σ = 23087712. Its totient is φ = 22954332.

The previous prime is 23020997. The next prime is 23021029. The reversal of 23021021 is 12012032.

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 not a de Polignac number, because 23021021 - 2¹⁴ = 23004637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23020993 and 23021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021029) 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, 32825 + ... + 33518.

It is an arithmetic number, because the mean of its divisors is an integer number (5771928).

Almost surely, 2^23021021 is an apocalyptic number.

It is an amenable number.

23021021 is a deficient number, since it is larger than the sum of its proper divisors (66691).

23021021 is an equidigital number, since it uses as much as digits as its factorization.

23021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66690.

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

The square root of 23021021 is about 4798.0226135357. The cubic root of 23021021 is about 284.4733106296.

Adding to 23021021 its reverse (12012032), we get a palindrome (35033053).

The spelling of 23021021 in words is "twenty-three million, twenty-one thousand, twenty-one".