202001211221 has 2 divisors, whose sum is σ = 202001211222. Its totient is φ = 202001211220.

The previous prime is 202001211199. The next prime is 202001211229. The reversal of 202001211221 is 122112100202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195351624196 + 6649587025 = 441986^2 + 81545^2 .

It is a cyclic number.

It is not a de Polignac number, because 202001211221 - 2⁶ = 202001211157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202001211196 and 202001211205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202001211229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101000605610 + 101000605611.

It is an arithmetic number, because the mean of its divisors is an integer number (101000605611).

Almost surely, 2^202001211221 is an apocalyptic number.

It is an amenable number.

202001211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202001211221 is an equidigital number, since it uses as much as digits as its factorization.

202001211221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202001211221 its reverse (122112100202), we get a palindrome (324113311423).

The spelling of 202001211221 in words is "two hundred two billion, one million, two hundred eleven thousand, two hundred twenty-one".