211956023 has 2 divisors, whose sum is σ = 211956024. Its totient is φ = 211956022.

The previous prime is 211956013. The next prime is 211956037. The reversal of 211956023 is 320659112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211956023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211956013) 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, 105978011 + 105978012.

It is an arithmetic number, because the mean of its divisors is an integer number (105978012).

Almost surely, 2^211956023 is an apocalyptic number.

211956023 is a deficient number, since it is larger than the sum of its proper divisors (1).

211956023 is an equidigital number, since it uses as much as digits as its factorization.

211956023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 211956023 is about 14558.7095238555. The cubic root of 211956023 is about 596.2319628817.

The spelling of 211956023 in words is "two hundred eleven million, nine hundred fifty-six thousand, twenty-three".