21296140 has 24 divisors (see below), whose sum is σ = 45264240. Its totient is φ = 8415168.

The previous prime is 21296129. The next prime is 21296159. The reversal of 21296140 is 4169212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4755 + ... + 8074.

It is an arithmetic number, because the mean of its divisors is an integer number (1886010).

Almost surely, 2^21296140 is an apocalyptic number.

21296140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21296140 is an abundant number, since it is smaller than the sum of its proper divisors (23968100).

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

21296140 is a wasteful number, since it uses less digits than its factorization.

21296140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12921 (or 12919 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21296140 is about 4614.7741006467. The cubic root of 21296140 is about 277.1832383755.

The spelling of 21296140 in words is "twenty-one million, two hundred ninety-six thousand, one hundred forty".