12372821 has 8 divisors (see below), whose sum is σ = 13552920. Its totient is φ = 11243008.

The previous prime is 12372817. The next prime is 12372859. The reversal of 12372821 is 12827321.

It can be written as a sum of positive squares in 4 ways, for example, as 2292196 + 10080625 = 1514^2 + 3175^2 .

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 12372821 - 2² = 12372817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12372121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12056 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (1694115).

Almost surely, 2^12372821 is an apocalyptic number.

It is an amenable number.

12372821 is a deficient number, since it is larger than the sum of its proper divisors (1180099).

12372821 is a wasteful number, since it uses less digits than its factorization.

12372821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25143.

The product of its digits is 1344, while the sum is 26.

The square root of 12372821 is about 3517.5020966589. The cubic root of 12372821 is about 231.2896736411.

The spelling of 12372821 in words is "twelve million, three hundred seventy-two thousand, eight hundred twenty-one".