212001220997 has 2 divisors, whose sum is σ = 212001220998. Its totient is φ = 212001220996.

The previous prime is 212001220927. The next prime is 212001221009. The reversal of 212001220997 is 799022100212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198843754561 + 13157466436 = 445919^2 + 114706^2 .

It is a cyclic number.

It is not a de Polignac number, because 212001220997 - 2¹² = 212001216901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212001220927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000610498 + 106000610499.

It is an arithmetic number, because the mean of its divisors is an integer number (106000610499).

Almost surely, 2^212001220997 is an apocalyptic number.

It is an amenable number.

212001220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001220997 is an equidigital number, since it uses as much as digits as its factorization.

212001220997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 212001220997 in words is "two hundred twelve billion, one million, two hundred twenty thousand, nine hundred ninety-seven".