212321101997 has 2 divisors, whose sum is σ = 212321101998. Its totient is φ = 212321101996.

The previous prime is 212321101987. The next prime is 212321102033. The reversal of 212321101997 is 799101123212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208470775396 + 3850326601 = 456586^2 + 62051^2 .

It is a cyclic number.

It is not a de Polignac number, because 212321101997 - 2²⁸ = 212052666541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212321101997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212321101987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106160550998 + 106160550999.

It is an arithmetic number, because the mean of its divisors is an integer number (106160550999).

Almost surely, 2^212321101997 is an apocalyptic number.

It is an amenable number.

212321101997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212321101997 is an equidigital number, since it uses as much as digits as its factorization.

212321101997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 212321101997 in words is "two hundred twelve billion, three hundred twenty-one million, one hundred one thousand, nine hundred ninety-seven".