202201100221021 has 6 divisors (see below), whose sum is σ = 222254101895966. Its totient is φ = 183819182019000.

The previous prime is 202201100220857. The next prime is 202201100221037. The reversal of 202201100221021 is 120122001102202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 113721002640025 + 88480097580996 = 10664005^2 + 9406386^2 .

It is a de Polignac number, because none of the positive numbers 2^k-202201100221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202201100220986 and 202201100221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202201100221061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 835541736330 + ... + 835541736571.

Almost surely, 2^{202201100221021} is an apocalyptic number.

It is an amenable number.

202201100221021 is a deficient number, since it is larger than the sum of its proper divisors (20053001674945).

202201100221021 is a wasteful number, since it uses less digits than its factorization.

202201100221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671083472923 (or 1671083472912 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202201100221021 its reverse (120122001102202), we get a palindrome (322323101323223).

The spelling of 202201100221021 in words is "two hundred two trillion, two hundred one billion, one hundred million, two hundred twenty-one thousand, twenty-one".