20202210021221 has 2 divisors, whose sum is σ = 20202210021222. Its totient is φ = 20202210021220.

The previous prime is 20202210021211. The next prime is 20202210021233. The reversal of 20202210021221 is 12212001220202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16804875390625 + 3397334630596 = 4099375^2 + 1843186^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202210021221 - 2¹⁸ = 20202209759077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20202210021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202210021211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101105010610 + 10101105010611.

It is an arithmetic number, because the mean of its divisors is an integer number (10101105010611).

Almost surely, 2^{20202210021221} is an apocalyptic number.

It is an amenable number.

20202210021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202210021221 is an equidigital number, since it uses as much as digits as its factorization.

20202210021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20202210021221 its reverse (12212001220202), we get a palindrome (32414211241423).

The spelling of 20202210021221 in words is "twenty trillion, two hundred two billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".