12692821 has 8 divisors (see below), whose sum is σ = 13054104. Its totient is φ = 12334080.

The previous prime is 12692809. The next prime is 12692831. The reversal of 12692821 is 12829621.

12692821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 790321 + 11902500 = 889^2 + 3450^2 .

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 12692821 - 2⁵ = 12692789 is a prime.

It is a super-2 number, since 2×12692821² = 322215409876082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12692831) 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, 14035 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (1631763).

Almost surely, 2^12692821 is an apocalyptic number.

It is an amenable number.

12692821 is a deficient number, since it is larger than the sum of its proper divisors (361283).

12692821 is an equidigital number, since it uses as much as digits as its factorization.

12692821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271.

The product of its digits is 3456, while the sum is 31.

The square root of 12692821 is about 3562.6985558703. The cubic root of 12692821 is about 233.2666855001.

The spelling of 12692821 in words is "twelve million, six hundred ninety-two thousand, eight hundred twenty-one".