12021999 has 8 divisors (see below), whose sum is σ = 17486592. Its totient is φ = 7286040.

The previous prime is 12021991. The next prime is 12022007. The reversal of 12021999 is 99912021.

12021999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12021991) and next prime (12022007).

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

It is not a de Polignac number, because 12021999 - 2³ = 12021991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 364303 = 12021999 / (1 + 2 + 0 + 2 + 1 + 9 + 9 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021991) 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, 182119 + ... + 182184.

It is an arithmetic number, because the mean of its divisors is an integer number (2185824).

Almost surely, 2^12021999 is an apocalyptic number.

12021999 is a deficient number, since it is larger than the sum of its proper divisors (5464593).

12021999 is a wasteful number, since it uses less digits than its factorization.

12021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364317.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 12021999 is about 3467.2754433416. The cubic root of 12021999 is about 229.0826662642.

The spelling of 12021999 in words is "twelve million, twenty-one thousand, nine hundred ninety-nine".