12451021 has 12 divisors (see below), whose sum is σ = 14493276. Its totient is φ = 10651520.

The previous prime is 12451013. The next prime is 12451039. The reversal of 12451021 is 12015421.

It can be written as a sum of positive squares in 2 ways, for example, as 4888521 + 7562500 = 2211^2 + 2750^2 .

It is not a de Polignac number, because 12451021 - 2³ = 12451013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12450986 and 12451004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12451051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 970 + ... + 5083.

It is an arithmetic number, because the mean of its divisors is an integer number (1207773).

Almost surely, 2^12451021 is an apocalyptic number.

12451021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12451021 is a deficient number, since it is larger than the sum of its proper divisors (2042255).

12451021 is a wasteful number, since it uses less digits than its factorization.

12451021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092 (or 6081 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 12451021 is about 3528.6004307657. The cubic root of 12451021 is about 231.7759244029.

Adding to 12451021 its reverse (12015421), we get a palindrome (24466442).

Subtracting from 12451021 its reverse (12015421), we obtain a square (435600 = 660²).

The spelling of 12451021 in words is "twelve million, four hundred fifty-one thousand, twenty-one".