22102201021 has 4 divisors (see below), whose sum is σ = 22404970972. Its totient is φ = 21799431072.

The previous prime is 22102201013. The next prime is 22102201067. The reversal of 22102201021 is 12010220122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12010220122 = 2 ⋅6005110061.

It can be written as a sum of positive squares in 2 ways, for example, as 17507259225 + 4594941796 = 132315^2 + 67786^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102201021 - 2³ = 22102201013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102200992 and 22102201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102201091) 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, 151384866 + ... + 151385011.

It is an arithmetic number, because the mean of its divisors is an integer number (5601242743).

Almost surely, 2^22102201021 is an apocalyptic number.

It is an amenable number.

22102201021 is a deficient number, since it is larger than the sum of its proper divisors (302769951).

22102201021 is an equidigital number, since it uses as much as digits as its factorization.

22102201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302769950.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22102201021 its reverse (12010220122), we get a palindrome (34112421143).

The spelling of 22102201021 in words is "twenty-two billion, one hundred two million, two hundred one thousand, twenty-one".