12102921 has 12 divisors (see below), whose sum is σ = 17812548. Its totient is φ = 7916064.

The previous prime is 12102919. The next prime is 12102941. The reversal of 12102921 is 12920121.

It can be written as a sum of positive squares in 2 ways, for example, as 3370896 + 8732025 = 1836^2 + 2955^2 .

It is not a de Polignac number, because 12102921 - 2¹ = 12102919 is a prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 12102894 and 12102903.

It is not an unprimeable number, because it can be changed into a prime (12102941) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 12210 + ... + 13163.

It is an arithmetic number, because the mean of its divisors is an integer number (1484379).

Almost surely, 2^12102921 is an apocalyptic number.

It is an amenable number.

12102921 is a deficient number, since it is larger than the sum of its proper divisors (5709627).

12102921 is a wasteful number, since it uses less digits than its factorization.

12102921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25432 (or 25429 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 12102921 is about 3478.9252650783. The cubic root of 12102921 is about 229.5955146590.

The spelling of 12102921 in words is "twelve million, one hundred two thousand, nine hundred twenty-one".