212021999993 has 2 divisors, whose sum is σ = 212021999994. Its totient is φ = 212021999992.

The previous prime is 212021999983. The next prime is 212022000031. The reversal of 212021999993 is 399999120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171584007529 + 40437992464 = 414227^2 + 201092^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021999993 - 2⁴ = 212021999977 is a prime.

It is not a weakly prime, because it can be changed into another prime (212021999983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010999996 + 106010999997.

It is an arithmetic number, because the mean of its divisors is an integer number (106010999997).

Almost surely, 2^212021999993 is an apocalyptic number.

It is an amenable number.

212021999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021999993 is an equidigital number, since it uses as much as digits as its factorization.

212021999993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The spelling of 212021999993 in words is "two hundred twelve billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-three".