23220020221 has 4 divisors (see below), whose sum is σ = 23220724032. Its totient is φ = 23219316412.

The previous prime is 23220020207. The next prime is 23220020273. The reversal of 23220020221 is 12202002232.

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 23220020221 - 2¹³ = 23220012029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23220020195 and 23220020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23220090221) 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, 299851 + ... + 369256.

It is an arithmetic number, because the mean of its divisors is an integer number (5805181008).

Almost surely, 2^23220020221 is an apocalyptic number.

It is an amenable number.

23220020221 is a deficient number, since it is larger than the sum of its proper divisors (703811).

23220020221 is an equidigital number, since it uses as much as digits as its factorization.

23220020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703810.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 23220020221 its reverse (12202002232), we get a palindrome (35422022453).

The spelling of 23220020221 in words is "twenty-three billion, two hundred twenty million, twenty thousand, two hundred twenty-one".