12219891 has 8 divisors (see below), whose sum is σ = 16391424. Its totient is φ = 8097480.

The previous prime is 12219871. The next prime is 12219901. The reversal of 12219891 is 19891221.

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

It is not a de Polignac number, because 12219891 - 2⁶ = 12219827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12219871) 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, 11695 + ... + 12696.

It is an arithmetic number, because the mean of its divisors is an integer number (2048928).

Almost surely, 2^12219891 is an apocalyptic number.

12219891 is a deficient number, since it is larger than the sum of its proper divisors (4171533).

12219891 is a wasteful number, since it uses less digits than its factorization.

12219891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24561.

The product of its digits is 2592, while the sum is 33.

The square root of 12219891 is about 3495.6960680242. The cubic root of 12219891 is about 230.3327948581.

The spelling of 12219891 in words is "twelve million, two hundred nineteen thousand, eight hundred ninety-one".