902211022021 has 4 divisors (see below), whose sum is σ = 903309940044. Its totient is φ = 901112104000.

The previous prime is 902211021937. The next prime is 902211022043. The reversal of 902211022021 is 120220112209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120220112209 = 43 ⋅2795816563.

It can be written as a sum of positive squares in 2 ways, for example, as 67281096996 + 834929925025 = 259386^2 + 913745^2 .

It is a cyclic number.

It is not a de Polignac number, because 902211022021 - 2²⁵ = 902177467589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 902211021983 and 902211022001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (902211022051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549457780 + ... + 549459421.

It is an arithmetic number, because the mean of its divisors is an integer number (225827485011).

Almost surely, 2^902211022021 is an apocalyptic number.

It is an amenable number.

902211022021 is a deficient number, since it is larger than the sum of its proper divisors (1098918023).

902211022021 is a wasteful number, since it uses less digits than its factorization.

902211022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098918022.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 902211022021 in words is "nine hundred two billion, two hundred eleven million, twenty-two thousand, twenty-one".