12970821 has 8 divisors (see below), whose sum is σ = 17696800. Its totient is φ = 8446032.

The previous prime is 12970819. The next prime is 12970823. The reversal of 12970821 is 12807921.

It is an interprime number because it is at equal distance from previous prime (12970819) and next prime (12970823).

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

It is not a de Polignac number, because 12970821 - 2¹ = 12970819 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 (12970823) 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, 50146 + ... + 50403.

It is an arithmetic number, because the mean of its divisors is an integer number (2212100).

Almost surely, 2^12970821 is an apocalyptic number.

It is an amenable number.

12970821 is a deficient number, since it is larger than the sum of its proper divisors (4725979).

12970821 is a wasteful number, since it uses less digits than its factorization.

12970821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100595.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 12970821 is about 3601.5026030811. The cubic root of 12970821 is about 234.9574149484.

The spelling of 12970821 in words is "twelve million, nine hundred seventy thousand, eight hundred twenty-one".