12221993 has 8 divisors (see below), whose sum is σ = 14575488. Its totient is φ = 10020384.

The previous prime is 12221981. The next prime is 12222013. The reversal of 12221993 is 39912221.

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 12221993 - 2¹⁰ = 12220969 is a prime.

It is a super-2 number, since 2×12221993² = 298754225784098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12221393) 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, 37796 + ... + 38117.

It is an arithmetic number, because the mean of its divisors is an integer number (1821936).

Almost surely, 2^12221993 is an apocalyptic number.

It is an amenable number.

12221993 is a deficient number, since it is larger than the sum of its proper divisors (2353495).

12221993 is an equidigital number, since it uses as much as digits as its factorization.

12221993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75943.

The product of its digits is 1944, while the sum is 29.

The square root of 12221993 is about 3495.9967105248. The cubic root of 12221993 is about 230.3460009709.

The spelling of 12221993 in words is "twelve million, two hundred twenty-one thousand, nine hundred ninety-three".