12860021 has 8 divisors (see below), whose sum is σ = 13348920. Its totient is φ = 12374208.

The previous prime is 12859997. The next prime is 12860033. The reversal of 12860021 is 12006821.

12860021 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 532900 + 12327121 = 730^2 + 3511^2 .

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 12860021 - 2¹⁰ = 12858997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12859975 and 12860002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12860051) 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, 10955 + ... + 12071.

It is an arithmetic number, because the mean of its divisors is an integer number (1668615).

Almost surely, 2^12860021 is an apocalyptic number.

It is an amenable number.

12860021 is a deficient number, since it is larger than the sum of its proper divisors (488899).

12860021 is a wasteful number, since it uses less digits than its factorization.

12860021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 12860021 is about 3586.0871433918. The cubic root of 12860021 is about 234.2864791872.

Adding to 12860021 its reverse (12006821), we get a palindrome (24866842).

The spelling of 12860021 in words is "twelve million, eight hundred sixty thousand, twenty-one".