12921370 has 64 divisors (see below), whose sum is σ = 29465856. Its totient is φ = 3962880.

The previous prime is 12921329. The next prime is 12921373. The reversal of 12921370 is 7312921.

It is not an unprimeable number, because it can be changed into a prime (12921373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74604 + ... + 74776.

It is an arithmetic number, because the mean of its divisors is an integer number (460404).

Almost surely, 2^12921370 is an apocalyptic number.

12921370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12921370 is an abundant number, since it is smaller than the sum of its proper divisors (16544486).

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

12921370 is a wasteful number, since it uses less digits than its factorization.

12921370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12921370 is about 3594.6307181684. The cubic root of 12921370 is about 234.6584445115.

It can be divided in two parts, 1292 and 1370, that added together give a palindrome (2662).

The spelling of 12921370 in words is "twelve million, nine hundred twenty-one thousand, three hundred seventy".