12021290 has 8 divisors (see below), whose sum is σ = 21638340. Its totient is φ = 4808512.

The previous prime is 12021287. The next prime is 12021299. The reversal of 12021290 is 9212021.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 1530169 = 3239^2 + 1237^2 .

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

It is a super-2 number, since 2×12021290² = 289022826528200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12021299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601055 + ... + 601074.

Almost surely, 2^12021290 is an apocalyptic number.

12021290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021290 is a deficient number, since it is larger than the sum of its proper divisors (9617050).

12021290 is a wasteful number, since it uses less digits than its factorization.

12021290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202136.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12021290 is about 3467.1732001733. The cubic root of 12021290 is about 229.0781627756.

The spelling of 12021290 in words is "twelve million, twenty-one thousand, two hundred ninety".