211220993 has 2 divisors, whose sum is σ = 211220994. Its totient is φ = 211220992.

The previous prime is 211220987. The next prime is 211221013. The reversal of 211220993 is 399022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140375104 + 70845889 = 11848^2 + 8417^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220993 - 2¹⁰ = 211219969 is a prime.

It is a super-2 number, since 2×211220993² = 89228615767812098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211228993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610496 + 105610497.

It is an arithmetic number, because the mean of its divisors is an integer number (105610497).

Almost surely, 2^211220993 is an apocalyptic number.

It is an amenable number.

211220993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220993 is an equidigital number, since it uses as much as digits as its factorization.

211220993 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 29.

The square root of 211220993 is about 14533.4439483558. The cubic root of 211220993 is about 595.5419519009.

The spelling of 211220993 in words is "two hundred eleven million, two hundred twenty thousand, nine hundred ninety-three".