211123031205 has 32 divisors (see below), whose sum is σ = 346594811904. Its totient is φ = 109680572736.

The previous prime is 211123031159. The next prime is 211123031219. The reversal of 211123031205 is 502130321112.

It is not a de Polignac number, because 211123031205 - 2¹¹ = 211123029157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209229 + ... + 682658.

It is an arithmetic number, because the mean of its divisors is an integer number (10831087872).

Almost surely, 2^211123031205 is an apocalyptic number.

It is an amenable number.

211123031205 is a deficient number, since it is larger than the sum of its proper divisors (135471780699).

211123031205 is a wasteful number, since it uses less digits than its factorization.

211123031205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892305.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 211123031205 its reverse (502130321112), we get a palindrome (713253352317).

The spelling of 211123031205 in words is "two hundred eleven billion, one hundred twenty-three million, thirty-one thousand, two hundred five".