20202110222221 has 2 divisors, whose sum is σ = 20202110222222. Its totient is φ = 20202110222220.

The previous prime is 20202110222213. The next prime is 20202110222249. The reversal of 20202110222221 is 12222201120202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17463121632100 + 2738988590121 = 4178890^2 + 1654989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202110222221 - 2³ = 20202110222213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202110222291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101055111110 + 10101055111111.

It is an arithmetic number, because the mean of its divisors is an integer number (10101055111111).

Almost surely, 2^{20202110222221} is an apocalyptic number.

It is an amenable number.

20202110222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202110222221 is an equidigital number, since it uses as much as digits as its factorization.

20202110222221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20202110222221 its reverse (12222201120202), we get a palindrome (32424311342423).

The spelling of 20202110222221 in words is "twenty trillion, two hundred two billion, one hundred ten million, two hundred twenty-two thousand, two hundred twenty-one".