212021111993 has 2 divisors, whose sum is σ = 212021111994. Its totient is φ = 212021111992.

The previous prime is 212021111987. The next prime is 212021112019. The reversal of 212021111993 is 399111120212.

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., 211680967744 + 340144249 = 460088^2 + 18443^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021111993 - 2⁴ = 212021111977 is a prime.

It is not a weakly prime, because it can be changed into another prime (212021111963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010555996 + 106010555997.

It is an arithmetic number, because the mean of its divisors is an integer number (106010555997).

Almost surely, 2^212021111993 is an apocalyptic number.

It is an amenable number.

212021111993 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021111993 is an equidigital number, since it uses as much as digits as its factorization.

212021111993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 212021111993 in words is "two hundred twelve billion, twenty-one million, one hundred eleven thousand, nine hundred ninety-three".