213100209997 has 2 divisors, whose sum is σ = 213100209998. Its totient is φ = 213100209996.

The previous prime is 213100209953. The next prime is 213100210021. The reversal of 213100209997 is 799902001312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174695577156 + 38404632841 = 417966^2 + 195971^2 .

It is a cyclic number.

It is not a de Polignac number, because 213100209997 - 2¹⁵ = 213100177229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213100209097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106550104998 + 106550104999.

It is an arithmetic number, because the mean of its divisors is an integer number (106550104999).

Almost surely, 2^213100209997 is an apocalyptic number.

It is an amenable number.

213100209997 is a deficient number, since it is larger than the sum of its proper divisors (1).

213100209997 is an equidigital number, since it uses as much as digits as its factorization.

213100209997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 43.

The spelling of 213100209997 in words is "two hundred thirteen billion, one hundred million, two hundred nine thousand, nine hundred ninety-seven".