212021121997 has 2 divisors, whose sum is σ = 212021121998. Its totient is φ = 212021121996.

The previous prime is 212021121953. The next prime is 212021122003. The reversal of 212021121997 is 799121120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149963337001 + 62057784996 = 387251^2 + 249114^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021121997 - 2⁷ = 212021121869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021121097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010560998 + 106010560999.

It is an arithmetic number, because the mean of its divisors is an integer number (106010560999).

Almost surely, 2^212021121997 is an apocalyptic number.

It is an amenable number.

212021121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021121997 is an equidigital number, since it uses as much as digits as its factorization.

212021121997 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 37.

The spelling of 212021121997 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, nine hundred ninety-seven".