13211711965 has 8 divisors (see below), whose sum is σ = 15994356408. Its totient is φ = 10475834880.

The previous prime is 13211711963. The next prime is 13211711971. The reversal of 13211711965 is 56911711231.

It can be written as a sum of positive squares in 4 ways, for example, as 1348799076 + 11862912889 = 36726^2 + 108917^2 .

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

It is not a de Polignac number, because 13211711965 - 2¹ = 13211711963 is a prime.

It is a super-2 number, since 2×13211711965² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211711963) 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, 11691216 + ... + 11692345.

It is an arithmetic number, because the mean of its divisors is an integer number (1999294551).

Almost surely, 2^13211711965 is an apocalyptic number.

It is an amenable number.

13211711965 is a deficient number, since it is larger than the sum of its proper divisors (2782644443).

13211711965 is a wasteful number, since it uses less digits than its factorization.

13211711965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23383679.

The product of its digits is 11340, while the sum is 37.

The spelling of 13211711965 in words is "thirteen billion, two hundred eleven million, seven hundred eleven thousand, nine hundred sixty-five".