211223993 has 4 divisors (see below), whose sum is σ = 211945188. Its totient is φ = 210502800.

The previous prime is 211223989. The next prime is 211224001. The reversal of 211223993 is 399322112.

211223993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 207734569 + 3489424 = 14413^2 + 1868^2 .

It is a cyclic number.

It is not a de Polignac number, because 211223993 - 2² = 211223989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211223393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360158 + ... + 360743.

It is an arithmetic number, because the mean of its divisors is an integer number (52986297).

Almost surely, 2^211223993 is an apocalyptic number.

It is an amenable number.

211223993 is a deficient number, since it is larger than the sum of its proper divisors (721195).

211223993 is an equidigital number, since it uses as much as digits as its factorization.

211223993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721194.

The product of its digits is 5832, while the sum is 32.

The square root of 211223993 is about 14533.5471582130. The cubic root of 211223993 is about 595.5447714082.

The spelling of 211223993 in words is "two hundred eleven million, two hundred twenty-three thousand, nine hundred ninety-three".