211231013 has 12 divisors (see below), whose sum is σ = 247898700. Its totient is φ = 179448192.

The previous prime is 211230997. The next prime is 211231049. The reversal of 211231013 is 310132112.

It can be written as a sum of positive squares in 2 ways, for example, as 87198244 + 124032769 = 9338^2 + 11137^2 .

It is not a de Polignac number, because 211231013 - 2⁴ = 211230997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211231063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13538 + ... + 24611.

It is an arithmetic number, because the mean of its divisors is an integer number (20658225).

Almost surely, 2^211231013 is an apocalyptic number.

It is an amenable number.

211231013 is a deficient number, since it is larger than the sum of its proper divisors (36667687).

211231013 is a wasteful number, since it uses less digits than its factorization.

211231013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38276 (or 38269 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 211231013 is about 14533.7886664145. The cubic root of 211231013 is about 595.5513689510.

Adding to 211231013 its reverse (310132112), we get a palindrome (521363125).

It can be divided in two parts, 2112 and 31013, that multiplied together give a palindrome (65499456).

The spelling of 211231013 in words is "two hundred eleven million, two hundred thirty-one thousand, thirteen".