1213212311 has 8 divisors (see below), whose sum is σ = 1266422400. Its totient is φ = 1160881920.

The previous prime is 1213212289. The next prime is 1213212323. The reversal of 1213212311 is 1132123121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213212311 - 2²² = 1209018007 is a prime.

It is a super-2 number, since 2×1213212311² = 2943768223123921442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213212311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213232311) 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, 217106 + ... + 222623.

It is an arithmetic number, because the mean of its divisors is an integer number (158302800).

Almost surely, 2^1213212311 is an apocalyptic number.

1213212311 is a deficient number, since it is larger than the sum of its proper divisors (53210089).

1213212311 is an equidigital number, since it uses as much as digits as its factorization.

1213212311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439849.

The product of its digits is 72, while the sum is 17.

The square root of 1213212311 is about 34831.1973810835. The cubic root of 1213212311 is about 1066.5443913331.

Adding to 1213212311 its reverse (1132123121), we get a palindrome (2345335432).

It can be divided in two parts, 1 and 213212311, that added together give a palindrome (213212312).

The spelling of 1213212311 in words is "one billion, two hundred thirteen million, two hundred twelve thousand, three hundred eleven".