202221011120021 has 2 divisors, whose sum is σ = 202221011120022. Its totient is φ = 202221011120020.

The previous prime is 202221011120017. The next prime is 202221011120033. The reversal of 202221011120021 is 120021110122202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114001767019921 + 88219244100100 = 10677161^2 + 9392510^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221011120021 - 2² = 202221011120017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202221011920021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110505560010 + 101110505560011.

It is an arithmetic number, because the mean of its divisors is an integer number (101110505560011).

Almost surely, 2^{202221011120021} is an apocalyptic number.

It is an amenable number.

202221011120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221011120021 is an equidigital number, since it uses as much as digits as its factorization.

202221011120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202221011120021 its reverse (120021110122202), we get a palindrome (322242121242223).

The spelling of 202221011120021 in words is "two hundred two trillion, two hundred twenty-one billion, eleven million, one hundred twenty thousand, twenty-one".