202102302221021 has 2 divisors, whose sum is σ = 202102302221022. Its totient is φ = 202102302221020.

The previous prime is 202102302220963. The next prime is 202102302221023. The reversal of 202102302221021 is 120122203201202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191345968521796 + 10756333699225 = 13832786^2 + 3279685^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102302221021 - 2⁶ = 202102302220957 is a prime.

It is a super-3 number, since 3×202102302221021³ (a number of 44 digits) contains 333 as substring.

Together with 202102302221023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 202102302220984 and 202102302221002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202102302221023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101051151110510 + 101051151110511.

It is an arithmetic number, because the mean of its divisors is an integer number (101051151110511).

Almost surely, 2^{202102302221021} is an apocalyptic number.

It is an amenable number.

202102302221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202102302221021 is an equidigital number, since it uses as much as digits as its factorization.

202102302221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 202102302221021 its reverse (120122203201202), we get a palindrome (322224505422223).

The spelling of 202102302221021 in words is "two hundred two trillion, one hundred two billion, three hundred two million, two hundred twenty-one thousand, twenty-one".