211229993 has 8 divisors (see below), whose sum is σ = 228425736. Its totient is φ = 194169600.

The previous prime is 211229987. The next prime is 211230023. The reversal of 211229993 is 399922112.

211229993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 29735209 + 181494784 = 5453^2 + 13472^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211229993 - 2⁸ = 211229737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211229903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30578 + ... + 36843.

It is an arithmetic number, because the mean of its divisors is an integer number (28553217).

Almost surely, 2^211229993 is an apocalyptic number.

It is an amenable number.

211229993 is a deficient number, since it is larger than the sum of its proper divisors (17195743).

211229993 is a wasteful number, since it uses less digits than its factorization.

211229993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67675.

The product of its digits is 17496, while the sum is 38.

The square root of 211229993 is about 14533.7535757285. The cubic root of 211229993 is about 595.5504103427.

The spelling of 211229993 in words is "two hundred eleven million, two hundred twenty-nine thousand, nine hundred ninety-three".