12021979 has 8 divisors (see below), whose sum is σ = 12741120. Its totient is φ = 11323200.

The previous prime is 12021973. The next prime is 12021991. The reversal of 12021979 is 97912021.

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 12021979 - 2¹³ = 12013787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021979.

It is not an unprimeable number, because it can be changed into a prime (12021973) 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, 3867 + ... + 6244.

It is an arithmetic number, because the mean of its divisors is an integer number (1592640).

Almost surely, 2^12021979 is an apocalyptic number.

12021979 is a deficient number, since it is larger than the sum of its proper divisors (719141).

12021979 is a wasteful number, since it uses less digits than its factorization.

12021979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10181.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 12021979 is about 3467.2725592315. The cubic root of 12021979 is about 229.0825392288.

The spelling of 12021979 in words is "twelve million, twenty-one thousand, nine hundred seventy-nine".