202200021221 has 4 divisors (see below), whose sum is σ = 220581841344. Its totient is φ = 183818201100.

The previous prime is 202200021151. The next prime is 202200021223. The reversal of 202200021221 is 122120002202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202200021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202200021196 and 202200021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202200021223) 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, 9190910045 + ... + 9190910066.

It is an arithmetic number, because the mean of its divisors is an integer number (55145460336).

Almost surely, 2^202200021221 is an apocalyptic number.

It is an amenable number.

202200021221 is a deficient number, since it is larger than the sum of its proper divisors (18381820123).

202200021221 is a wasteful number, since it uses less digits than its factorization.

202200021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18381820122.

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

Adding to 202200021221 its reverse (122120002202), we get a palindrome (324320023423).

The spelling of 202200021221 in words is "two hundred two billion, two hundred million, twenty-one thousand, two hundred twenty-one".