22021020221 has 16 divisors (see below), whose sum is σ = 23057227776. Its totient is φ = 21007350000.

The previous prime is 22021020211. The next prime is 22021020223. The reversal of 22021020221 is 12202012022.

It is a cyclic number.

It is not a de Polignac number, because 22021020221 - 2²² = 22016825917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021020196 and 22021020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021020223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595256 + ... + 631166.

It is an arithmetic number, because the mean of its divisors is an integer number (1441076736).

Almost surely, 2^22021020221 is an apocalyptic number.

It is an amenable number.

22021020221 is a deficient number, since it is larger than the sum of its proper divisors (1036207555).

22021020221 is a wasteful number, since it uses less digits than its factorization.

22021020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36224.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 22021020221 its reverse (12202012022), we get a palindrome (34223032243).

The spelling of 22021020221 in words is "twenty-two billion, twenty-one million, twenty thousand, two hundred twenty-one".