202120022221 has 4 divisors (see below), whose sum is σ = 217667716252. Its totient is φ = 186572328192.

The previous prime is 202120022213. The next prime is 202120022249. The reversal of 202120022221 is 122220021202.

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 65969354025 + 136150668196 = 256845^2 + 368986^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120022221 - 2³ = 202120022213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202120022195 and 202120022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120022201) 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, 7773846996 + ... + 7773847021.

It is an arithmetic number, because the mean of its divisors is an integer number (54416929063).

Almost surely, 2^202120022221 is an apocalyptic number.

It is an amenable number.

202120022221 is a deficient number, since it is larger than the sum of its proper divisors (15547694031).

202120022221 is a wasteful number, since it uses less digits than its factorization.

202120022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15547694030.

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

Adding to 202120022221 its reverse (122220021202), we get a palindrome (324340043423).

The spelling of 202120022221 in words is "two hundred two billion, one hundred twenty million, twenty-two thousand, two hundred twenty-one".