12021251 has 8 divisors (see below), whose sum is σ = 13191984. Its totient is φ = 10863520.

The previous prime is 12021187. The next prime is 12021259. The reversal of 12021251 is 15212021.

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

It is a cyclic number.

It is not a de Polignac number, because 12021251 - 2⁶ = 12021187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021259) 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 7 ways as a sum of consecutive naturals, for example, 1256 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (1648998).

Almost surely, 2^12021251 is an apocalyptic number.

12021251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12021251 is a deficient number, since it is larger than the sum of its proper divisors (1170733).

12021251 is a wasteful number, since it uses less digits than its factorization.

12021251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6501.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 12021251 is about 3467.1675759905. The cubic root of 12021251 is about 229.0779150469.

Adding to 12021251 its reverse (15212021), we get a palindrome (27233272).

The spelling of 12021251 in words is "twelve million, twenty-one thousand, two hundred fifty-one".