1215211313 has 8 divisors (see below), whose sum is σ = 1248965760. Its totient is φ = 1181504880.

The previous prime is 1215211297. The next prime is 1215211337. The reversal of 1215211313 is 3131125121.

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 1215211313 - 2⁴ = 1215211297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215211373) 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, 42728 + ... + 65238.

It is an arithmetic number, because the mean of its divisors is an integer number (156120720).

Almost surely, 2^1215211313 is an apocalyptic number.

It is an amenable number.

1215211313 is a deficient number, since it is larger than the sum of its proper divisors (33754447).

1215211313 is a wasteful number, since it uses less digits than its factorization.

1215211313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24007.

The product of its digits is 180, while the sum is 20.

The square root of 1215211313 is about 34859.8811386384. The cubic root of 1215211313 is about 1067.1298493079.

Adding to 1215211313 its reverse (3131125121), we get a palindrome (4346336434).

The spelling of 1215211313 in words is "one billion, two hundred fifteen million, two hundred eleven thousand, three hundred thirteen".