211226931 has 6 divisors (see below), whose sum is σ = 305105580. Its totient is φ = 140817948.

The previous prime is 211226929. The next prime is 211226959. The reversal of 211226931 is 139622112.

It is not a de Polignac number, because 211226931 - 2¹ = 211226929 is a prime.

It is a super-2 number, since 2×211226931² = 89233632759357522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211226895 and 211226904.

It is not an unprimeable number, because it can be changed into a prime (211226231) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 11734821 + ... + 11734838.

It is an arithmetic number, because the mean of its divisors is an integer number (50850930).

Almost surely, 2^211226931 is an apocalyptic number.

211226931 is a deficient number, since it is larger than the sum of its proper divisors (93878649).

211226931 is a wasteful number, since it uses less digits than its factorization.

211226931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23469665 (or 23469662 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 211226931 is about 14533.6482343560. The cubic root of 211226931 is about 595.5475326198.

The spelling of 211226931 in words is "two hundred eleven million, two hundred twenty-six thousand, nine hundred thirty-one".