202222111100021 has 4 divisors (see below), whose sum is σ = 202487843178444. Its totient is φ = 201956379021600.

The previous prime is 202222111100003. The next prime is 202222111100027. The reversal of 202222111100021 is 120001111222202.

202222111100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18051970035121 + 184170141064900 = 4248761^2 + 13570930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202222111100021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202222111100027) 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, 132866038070 + ... + 132866039591.

It is an arithmetic number, because the mean of its divisors is an integer number (50621960794611).

Almost surely, 2^{202222111100021} is an apocalyptic number.

It is an amenable number.

202222111100021 is a deficient number, since it is larger than the sum of its proper divisors (265732078423).

202222111100021 is an equidigital number, since it uses as much as digits as its factorization.

202222111100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265732078422.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202222111100021 its reverse (120001111222202), we get a palindrome (322223222322223).

The spelling of 202222111100021 in words is "two hundred two trillion, two hundred twenty-two billion, one hundred eleven million, one hundred thousand, twenty-one".