21348859 has 12 divisors (see below), whose sum is σ = 24935904. Its totient is φ = 18224304.

The previous prime is 21348851. The next prime is 21348883. The reversal of 21348859 is 95884312.

It is not a de Polignac number, because 21348859 - 2³ = 21348851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21348851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13614 + ... + 15100.

It is an arithmetic number, because the mean of its divisors is an integer number (2077992).

Almost surely, 2^21348859 is an apocalyptic number.

21348859 is a deficient number, since it is larger than the sum of its proper divisors (3587045).

21348859 is a wasteful number, since it uses less digits than its factorization.

21348859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1787 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 21348859 is about 4620.4825505568. The cubic root of 21348859 is about 277.4117740255.

The spelling of 21348859 in words is "twenty-one million, three hundred forty-eight thousand, eight hundred fifty-nine".