211051813 has 16 divisors (see below), whose sum is σ = 250297344. Its totient is φ = 174142080.

The previous prime is 211051807. The next prime is 211051823. The reversal of 211051813 is 318150112.

It is not a de Polignac number, because 211051813 - 2²⁵ = 177497381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211051823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40281 + ... + 45217.

It is an arithmetic number, because the mean of its divisors is an integer number (15643584).

Almost surely, 2^211051813 is an apocalyptic number.

It is an amenable number.

211051813 is a deficient number, since it is larger than the sum of its proper divisors (39245531).

211051813 is a wasteful number, since it uses less digits than its factorization.

211051813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 211051813 is about 14527.6224138708. The cubic root of 211051813 is about 595.3829072625.

The spelling of 211051813 in words is "two hundred eleven million, fifty-one thousand, eight hundred thirteen".