212021993 has 2 divisors, whose sum is σ = 212021994. Its totient is φ = 212021992.

The previous prime is 212021983. The next prime is 212022023. The reversal of 212021993 is 399120212.

212021993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185313769 + 26708224 = 13613^2 + 5168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021993 is a prime.

It is not a weakly prime, because it can be changed into another prime (212021903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010996 + 106010997.

It is an arithmetic number, because the mean of its divisors is an integer number (106010997).

Almost surely, 2^212021993 is an apocalyptic number.

It is an amenable number.

212021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021993 is an equidigital number, since it uses as much as digits as its factorization.

212021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 212021993 is about 14560.9750016955. The cubic root of 212021993 is about 596.2938143010.

The spelling of 212021993 in words is "two hundred twelve million, twenty-one thousand, nine hundred ninety-three".