202120102001 has 2 divisors, whose sum is σ = 202120102002. Its totient is φ = 202120102000.

The previous prime is 202120101991. The next prime is 202120102007. The reversal of 202120102001 is 100201021202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199430123776 + 2689978225 = 446576^2 + 51865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202120102001 is a prime.

It is not a weakly prime, because it can be changed into another prime (202120102007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060051000 + 101060051001.

It is an arithmetic number, because the mean of its divisors is an integer number (101060051001).

Almost surely, 2^202120102001 is an apocalyptic number.

It is an amenable number.

202120102001 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120102001 is an equidigital number, since it uses as much as digits as its factorization.

202120102001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 202120102001 its reverse (100201021202), we get a palindrome (302321123203).

The spelling of 202120102001 in words is "two hundred two billion, one hundred twenty million, one hundred two thousand, one".