210121013212997 has 2 divisors, whose sum is σ = 210121013212998. Its totient is φ = 210121013212996.

The previous prime is 210121013212991. The next prime is 210121013213009. The reversal of 210121013212997 is 799212310121012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171104424714721 + 39016588498276 = 13080689^2 + 6246326^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121013212997 - 2²⁴ = 210120996435781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210121013212991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060506606498 + 105060506606499.

It is an arithmetic number, because the mean of its divisors is an integer number (105060506606499).

Almost surely, 2^{210121013212997} is an apocalyptic number.

It is an amenable number.

210121013212997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121013212997 is an equidigital number, since it uses as much as digits as its factorization.

210121013212997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 210121013212997 in words is "two hundred ten trillion, one hundred twenty-one billion, thirteen million, two hundred twelve thousand, nine hundred ninety-seven".