22021220221 has 16 divisors (see below), whose sum is σ = 29566954368. Its totient is φ = 15839438400.

The previous prime is 22021220219. The next prime is 22021220237. The reversal of 22021220221 is 12202212022.

It is a cyclic number.

It is not a de Polignac number, because 22021220221 - 2¹ = 22021220219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22021220195 and 22021220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021220251) 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, 10998610 + ... + 11000611.

It is an arithmetic number, because the mean of its divisors is an integer number (1847934648).

Almost surely, 2^22021220221 is an apocalyptic number.

It is an amenable number.

22021220221 is a deficient number, since it is larger than the sum of its proper divisors (7545734147).

22021220221 is a wasteful number, since it uses less digits than its factorization.

22021220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21999252.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22021220221 its reverse (12202212022), we get a palindrome (34223432243).

It can be divided in two parts, 22021 and 220221, that added together give a palindrome (242242).

The spelling of 22021220221 in words is "twenty-two billion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".