210236521997 has 2 divisors, whose sum is σ = 210236521998. Its totient is φ = 210236521996.

The previous prime is 210236521993. The next prime is 210236522011. The reversal of 210236521997 is 799125632012.

210236521997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202217498596 + 8019023401 = 449686^2 + 89549^2 .

It is a cyclic number.

It is not a de Polignac number, because 210236521997 - 2² = 210236521993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210236521993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105118260998 + 105118260999.

It is an arithmetic number, because the mean of its divisors is an integer number (105118260999).

Almost surely, 2^210236521997 is an apocalyptic number.

It is an amenable number.

210236521997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210236521997 is an equidigital number, since it uses as much as digits as its factorization.

210236521997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 210236521997 in words is "two hundred ten billion, two hundred thirty-six million, five hundred twenty-one thousand, nine hundred ninety-seven".