12121858 has 8 divisors (see below), whose sum is σ = 20780352. Its totient is φ = 5195076.

The previous prime is 12121831. The next prime is 12121871. The reversal of 12121858 is 85812121.

12121858 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

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

It is an alternating number because its digits alternate between odd and even.

12121858 is strictly pandigital in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432910 + ... + 432937.

It is an arithmetic number, because the mean of its divisors is an integer number (2597544).

Almost surely, 2^12121858 is an apocalyptic number.

12121858 is a deficient number, since it is larger than the sum of its proper divisors (8658494).

12121858 is an equidigital number, since it uses as much as digits as its factorization.

12121858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865856.

The product of its digits is 1280, while the sum is 28.

The square root of 12121858 is about 3481.6458751573. The cubic root of 12121858 is about 229.7151988408.

Adding to 12121858 its reverse (85812121), we get a palindrome (97933979).

The spelling of 12121858 in words is "twelve million, one hundred twenty-one thousand, eight hundred fifty-eight".