23221021 has 4 divisors (see below), whose sum is σ = 24443200. Its totient is φ = 21998844.

The previous prime is 23221019. The next prime is 23221063. The reversal of 23221021 is 12012232.

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 23221021 - 2¹ = 23221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23220992 and 23221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221091) 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, 611061 + ... + 611098.

It is an arithmetic number, because the mean of its divisors is an integer number (6110800).

Almost surely, 2^23221021 is an apocalyptic number.

It is an amenable number.

23221021 is a deficient number, since it is larger than the sum of its proper divisors (1222179).

23221021 is a wasteful number, since it uses less digits than its factorization.

23221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222178.

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

The square root of 23221021 is about 4818.8194612374. The cubic root of 23221021 is about 285.2947438071.

Adding to 23221021 its reverse (12012232), we get a palindrome (35233253).

The spelling of 23221021 in words is "twenty-three million, two hundred twenty-one thousand, twenty-one".