22001020221 has 4 divisors (see below), whose sum is σ = 29334693632. Its totient is φ = 14667346812.

The previous prime is 22001020213. The next prime is 22001020229. The reversal of 22001020221 is 12202010022.

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 (22001020213) and next prime (22001020229).

It is not a de Polignac number, because 22001020221 - 2³ = 22001020213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001020197 and 22001020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001020229) 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, 3666836701 + ... + 3666836706.

It is an arithmetic number, because the mean of its divisors is an integer number (7333673408).

Almost surely, 2^22001020221 is an apocalyptic number.

It is an amenable number.

22001020221 is a deficient number, since it is larger than the sum of its proper divisors (7333673411).

22001020221 is an equidigital number, since it uses as much as digits as its factorization.

22001020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7333673410.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22001020221 its reverse (12202010022), we get a palindrome (34203030243).

The spelling of 22001020221 in words is "twenty-two billion, one million, twenty thousand, two hundred twenty-one".