12021890 has 16 divisors (see below), whose sum is σ = 22912632. Its totient is φ = 4525824.

The previous prime is 12021881. The next prime is 12021913. The reversal of 12021890 is 9812021.

It can be written as a sum of positive squares in 4 ways, for example, as 10883401 + 1138489 = 3299^2 + 1067^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35189 + ... + 35528.

Almost surely, 2^12021890 is an apocalyptic number.

12021890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021890 is a deficient number, since it is larger than the sum of its proper divisors (10890742).

12021890 is a wasteful number, since it uses less digits than its factorization.

12021890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70741.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 12021890 is about 3467.2597249125. The cubic root of 12021890 is about 229.0819739199.

The spelling of 12021890 in words is "twelve million, twenty-one thousand, eight hundred ninety".