211900005 has 12 divisors (see below), whose sum is σ = 367293420. Its totient is φ = 113013312.

The previous prime is 211899983. The next prime is 211900043. The reversal of 211900005 is 500009112.

It can be written as a sum of positive squares in 2 ways, for example, as 123276609 + 88623396 = 11103^2 + 9414^2 .

It is not a de Polignac number, because 211900005 - 2⁸ = 211899749 is a prime.

It is a super-2 number, since 2×211900005² = 89803224238000050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 2354400 + ... + 2354489.

It is an arithmetic number, because the mean of its divisors is an integer number (30607785).

Almost surely, 2^211900005 is an apocalyptic number.

It is an amenable number.

211900005 is a deficient number, since it is larger than the sum of its proper divisors (155393415).

211900005 is a wasteful number, since it uses less digits than its factorization.

211900005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708900 (or 4708897 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 211900005 is about 14556.7855311535. The cubic root of 211900005 is about 596.1794320714.

Adding to 211900005 its reverse (500009112), we get a palindrome (711909117).

The spelling of 211900005 in words is "two hundred eleven million, nine hundred thousand, five".