12211965 has 72 divisors (see below), whose sum is σ = 24155040. Its totient is φ = 5901984.

The previous prime is 12211949. The next prime is 12211981. The reversal of 12211965 is 56911221.

It is an interprime number because it is at equal distance from previous prime (12211949) and next prime (12211981).

It is not a de Polignac number, because 12211965 - 2⁴ = 12211949 is a prime.

It is a super-2 number, since 2×12211965² = 298264178322450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 530944 + ... + 530966.

Almost surely, 2^12211965 is an apocalyptic number.

12211965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12211965 is a deficient number, since it is larger than the sum of its proper divisors (11943075).

12211965 is an equidigital number, since it uses as much as digits as its factorization.

12211965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 50 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 12211965 is about 3494.5622043398. The cubic root of 12211965 is about 230.2829850144.

The spelling of 12211965 in words is "twelve million, two hundred eleven thousand, nine hundred sixty-five".