12921140 has 48 divisors (see below), whose sum is σ = 29366400. Its totient is φ = 4758912.

The previous prime is 12921137. The next prime is 12921163. The reversal of 12921140 is 4112921.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13601 + ... + 14519.

It is an arithmetic number, because the mean of its divisors is an integer number (611800).

Almost surely, 2^12921140 is an apocalyptic number.

12921140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12921140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14683200).

12921140 is an abundant number, since it is smaller than the sum of its proper divisors (16445260).

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

12921140 is a wasteful number, since it uses less digits than its factorization.

12921140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 12921140 is about 3594.5987258664. The cubic root of 12921140 is about 234.6570521988.

The spelling of 12921140 in words is "twelve million, nine hundred twenty-one thousand, one hundred forty".