202202021261 has 2 divisors, whose sum is σ = 202202021262. Its totient is φ = 202202021260.

The previous prime is 202202021207. The next prime is 202202021269. The reversal of 202202021261 is 162120202202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153365441161 + 48836580100 = 391619^2 + 220990^2 .

It is a cyclic number.

It is not a de Polignac number, because 202202021261 - 2¹⁸ = 202201759117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202202021269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101101010630 + 101101010631.

It is an arithmetic number, because the mean of its divisors is an integer number (101101010631).

Almost surely, 2^202202021261 is an apocalyptic number.

It is an amenable number.

202202021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

202202021261 is an equidigital number, since it uses as much as digits as its factorization.

202202021261 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 202202021261 its reverse (162120202202), we get a palindrome (364322223463).

The spelling of 202202021261 in words is "two hundred two billion, two hundred two million, twenty-one thousand, two hundred sixty-one".