2211531213 has 16 divisors (see below), whose sum is σ = 3183016320. Its totient is φ = 1361621184.

The previous prime is 2211531209. The next prime is 2211531229. The reversal of 2211531213 is 3121351122.

It is not a de Polignac number, because 2211531213 - 2² = 2211531209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2211531213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211531313) 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, 550606 + ... + 554607.

It is an arithmetic number, because the mean of its divisors is an integer number (198938520).

Almost surely, 2^2211531213 is an apocalyptic number.

2211531213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2211531213 is a deficient number, since it is larger than the sum of its proper divisors (971485107).

2211531213 is a wasteful number, since it uses less digits than its factorization.

2211531213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105268.

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

The square root of 2211531213 is about 47026.9200883919. The cubic root of 2211531213 is about 1302.8598211362.

Adding to 2211531213 its reverse (3121351122), we get a palindrome (5332882335).

The spelling of 2211531213 in words is "two billion, two hundred eleven million, five hundred thirty-one thousand, two hundred thirteen".