20222607721 has 4 divisors (see below), whose sum is σ = 20225419344. Its totient is φ = 20219796100.

The previous prime is 20222607709. The next prime is 20222607733. The reversal of 20222607721 is 12770622202.

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 an interprime number because it is at equal distance from previous prime (20222607709) and next prime (20222607733).

It is a cyclic number.

It is not a de Polignac number, because 20222607721 - 2⁷ = 20222607593 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20222607781) 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, 1394995 + ... + 1409416.

It is an arithmetic number, because the mean of its divisors is an integer number (5056354836).

Almost surely, 2^20222607721 is an apocalyptic number.

It is an amenable number.

20222607721 is a deficient number, since it is larger than the sum of its proper divisors (2811623).

20222607721 is an equidigital number, since it uses as much as digits as its factorization.

20222607721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811622.

The product of its (nonzero) digits is 9408, while the sum is 31.

The spelling of 20222607721 in words is "twenty billion, two hundred twenty-two million, six hundred seven thousand, seven hundred twenty-one".