12700821 has 8 divisors (see below), whose sum is σ = 19353664. Its totient is φ = 7257600.

The previous prime is 12700817. The next prime is 12700823. The reversal of 12700821 is 12800721.

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

It is not a de Polignac number, because 12700821 - 2² = 12700817 is a prime.

It is a super-2 number, since 2×12700821² = 322621708148082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 604801 = 12700821 / (1 + 2 + 7 + 0 + 0 + 8 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12700823) 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 7 ways as a sum of consecutive naturals, for example, 302380 + ... + 302421.

It is an arithmetic number, because the mean of its divisors is an integer number (2419208).

Almost surely, 2^12700821 is an apocalyptic number.

It is an amenable number.

12700821 is a deficient number, since it is larger than the sum of its proper divisors (6652843).

12700821 is an equidigital number, since it uses as much as digits as its factorization.

12700821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604811.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 12700821 is about 3563.8211234572. The cubic root of 12700821 is about 233.3156827918.

The spelling of 12700821 in words is "twelve million, seven hundred thousand, eight hundred twenty-one".