21494860 has 24 divisors (see below), whose sum is σ = 45543456. Its totient is φ = 8520960.

The previous prime is 21494849. The next prime is 21494861. The reversal of 21494860 is 6849412.

It is not an unprimeable number, because it can be changed into a prime (21494861) 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, 2496 + ... + 7015.

It is an arithmetic number, because the mean of its divisors is an integer number (1897644).

Almost surely, 2^21494860 is an apocalyptic number.

21494860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21494860 is an abundant number, since it is smaller than the sum of its proper divisors (24048596).

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

21494860 is a wasteful number, since it uses less digits than its factorization.

21494860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9633 (or 9631 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21494860 is about 4636.2549541629. The cubic root of 21494860 is about 278.0427275906.

The spelling of 21494860 in words is "twenty-one million, four hundred ninety-four thousand, eight hundred sixty".