1213311211 has 8 divisors (see below), whose sum is σ = 1400937440. Its totient is φ = 1029259008.

The previous prime is 1213311191. The next prime is 1213311217. The reversal of 1213311211 is 1121133121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213311211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213311217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 892776 + ... + 894133.

It is an arithmetic number, because the mean of its divisors is an integer number (175117180).

Almost surely, 2^1213311211 is an apocalyptic number.

1213311211 is a deficient number, since it is larger than the sum of its proper divisors (187626229).

1213311211 is an equidigital number, since it uses as much as digits as its factorization.

1213311211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787013.

The product of its digits is 36, while the sum is 16.

The square root of 1213311211 is about 34832.6170564315. The cubic root of 1213311211 is about 1066.5733717991.

Adding to 1213311211 its reverse (1121133121), we get a palindrome (2334444332).

The spelling of 1213311211 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, two hundred eleven".