12921040 has 40 divisors (see below), whose sum is σ = 32774688. Its totient is φ = 4698240.

The previous prime is 12921011. The next prime is 12921049. The reversal of 12921040 is 4012921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 12920999 and 12921017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921049) 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, 6462 + ... + 8221.

Almost surely, 2^12921040 is an apocalyptic number.

12921040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12921040 is an abundant number, since it is smaller than the sum of its proper divisors (19853648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12921040 is a wasteful number, since it uses less digits than its factorization.

12921040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14707 (or 14701 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12921040 is about 3594.5848160810. The cubic root of 12921040 is about 234.6564468403.

Adding to 12921040 its reverse (4012921), we get a palindrome (16933961).

It can be divided in two parts, 1292 and 1040, that added together give a palindrome (2332).

The spelling of 12921040 in words is "twelve million, nine hundred twenty-one thousand, forty".