23221421 has 4 divisors (see below), whose sum is σ = 24231072. Its totient is φ = 22211772.

The previous prime is 23221417. The next prime is 23221447. The reversal of 23221421 is 12412232.

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 23221421 - 2² = 23221417 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 23221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221411) 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, 504791 + ... + 504836.

It is an arithmetic number, because the mean of its divisors is an integer number (6057768).

Almost surely, 2^23221421 is an apocalyptic number.

It is an amenable number.

23221421 is a deficient number, since it is larger than the sum of its proper divisors (1009651).

23221421 is a wasteful number, since it uses less digits than its factorization.

23221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009650.

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

The square root of 23221421 is about 4818.8609649999. The cubic root of 23221421 is about 285.2963819384.

Adding to 23221421 its reverse (12412232), we get a palindrome (35633653).

The spelling of 23221421 in words is "twenty-three million, two hundred twenty-one thousand, four hundred twenty-one".