12098021 has 4 divisors (see below), whose sum is σ = 13028652. Its totient is φ = 11167392.

The previous prime is 12097991. The next prime is 12098027. The reversal of 12098021 is 12089021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1240996 + 10857025 = 1114^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 12098021 - 2⁶ = 12097957 is a prime.

It is a super-2 number, since 2×12098021² = 292724224232882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12098027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465296 + ... + 465321.

It is an arithmetic number, because the mean of its divisors is an integer number (3257163).

Almost surely, 2^12098021 is an apocalyptic number.

It is an amenable number.

12098021 is a deficient number, since it is larger than the sum of its proper divisors (930631).

12098021 is an equidigital number, since it uses as much as digits as its factorization.

12098021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930630.

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

The square root of 12098021 is about 3478.2209533036. The cubic root of 12098021 is about 229.5645257244.

The spelling of 12098021 in words is "twelve million, ninety-eight thousand, twenty-one".