12801021 has 4 divisors (see below), whose sum is σ = 17068032. Its totient is φ = 8534012.

The previous prime is 12801013. The next prime is 12801031. The reversal of 12801021 is 12010821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12801021 - 2³ = 12801013 is a prime.

It is a super-2 number, since 2×12801021² = 327732277284882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12801031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133501 + ... + 2133506.

It is an arithmetic number, because the mean of its divisors is an integer number (4267008).

Almost surely, 2^12801021 is an apocalyptic number.

It is an amenable number.

12801021 is a deficient number, since it is larger than the sum of its proper divisors (4267011).

12801021 is an equidigital number, since it uses as much as digits as its factorization.

12801021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267010.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 12801021 is about 3577.8514502422. The cubic root of 12801021 is about 233.9276385211.

Adding to 12801021 its reverse (12010821), we get a palindrome (24811842).

The spelling of 12801021 in words is "twelve million, eight hundred one thousand, twenty-one".