202110001997 has 2 divisors, whose sum is σ = 202110001998. Its totient is φ = 202110001996.

The previous prime is 202110001903. The next prime is 202110002009. The reversal of 202110001997 is 799100011202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190218971881 + 11891030116 = 436141^2 + 109046^2 .

It is a cyclic number.

It is not a de Polignac number, because 202110001997 - 2²² = 202105807693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202110001097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101055000998 + 101055000999.

It is an arithmetic number, because the mean of its divisors is an integer number (101055000999).

Almost surely, 2^202110001997 is an apocalyptic number.

It is an amenable number.

202110001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

202110001997 is an equidigital number, since it uses as much as digits as its factorization.

202110001997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The spelling of 202110001997 in words is "two hundred two billion, one hundred ten million, one thousand, nine hundred ninety-seven".