212121983 has 2 divisors, whose sum is σ = 212121984. Its totient is φ = 212121982.

The previous prime is 212121961. The next prime is 212121989. The reversal of 212121983 is 389121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212121983 - 2⁶ = 212121919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212121989) 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, 106060991 + 106060992.

It is an arithmetic number, because the mean of its divisors is an integer number (106060992).

Almost surely, 2^212121983 is an apocalyptic number.

212121983 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121983 is an equidigital number, since it uses as much as digits as its factorization.

212121983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 212121983 is about 14564.4080895861. The cubic root of 212121983 is about 596.3875373582.

The spelling of 212121983 in words is "two hundred twelve million, one hundred twenty-one thousand, nine hundred eighty-three".