202255552021 has 4 divisors (see below), whose sum is σ = 214152937452. Its totient is φ = 190358166592.

The previous prime is 202255551989. The next prime is 202255552043. The reversal of 202255552021 is 120255552202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120255552202 = 2 ⋅60127776101.

It can be written as a sum of positive squares in 2 ways, for example, as 119742989521 + 82512562500 = 346039^2 + 287250^2 .

It is a cyclic number.

It is not a de Polignac number, because 202255552021 - 2⁵ = 202255551989 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 (202255553021) 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, 5948692690 + ... + 5948692723.

It is an arithmetic number, because the mean of its divisors is an integer number (53538234363).

Almost surely, 2^202255552021 is an apocalyptic number.

It is an amenable number.

202255552021 is a deficient number, since it is larger than the sum of its proper divisors (11897385431).

202255552021 is a wasteful number, since it uses less digits than its factorization.

202255552021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11897385430.

The product of its (nonzero) digits is 20000, while the sum is 31.

The spelling of 202255552021 in words is "two hundred two billion, two hundred fifty-five million, five hundred fifty-two thousand, twenty-one".