12693421 has 6 divisors (see below), whose sum is σ = 13745130. Its totient is φ = 11716848.

The previous prime is 12693413. The next prime is 12693449. The reversal of 12693421 is 12439621.

It is the 1455-th star number.

It can be written as a sum of positive squares in 3 ways, for example, as 617796 + 12075625 = 786^2 + 3475^2 .

It is not a de Polignac number, because 12693421 - 2³ = 12693413 is a prime.

It is a super-2 number, since 2×12693421² = 322245873366482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12693421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12693491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37386 + ... + 37723.

It is an arithmetic number, because the mean of its divisors is an integer number (2290855).

Almost surely, 2^12693421 is an apocalyptic number.

It is an amenable number.

12693421 is a deficient number, since it is larger than the sum of its proper divisors (1051709).

12693421 is an equidigital number, since it uses as much as digits as its factorization.

12693421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75135 (or 75122 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 12693421 is about 3562.7827607083. The cubic root of 12693421 is about 233.2703610110.

The spelling of 12693421 in words is "twelve million, six hundred ninety-three thousand, four hundred twenty-one".