21559014 has 16 divisors (see below), whose sum is σ = 47909040. Its totient is φ = 7186320.

The previous prime is 21558997. The next prime is 21559019. The reversal of 21559014 is 41095512.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21559019) 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, 199567 + ... + 199674.

It is an arithmetic number, because the mean of its divisors is an integer number (2994315).

Almost surely, 2^21559014 is an apocalyptic number.

21559014 is an abundant number, since it is smaller than the sum of its proper divisors (26350026).

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

21559014 is a wasteful number, since it uses less digits than its factorization.

21559014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399252 (or 399246 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 21559014 is about 4643.1685302173. The cubic root of 21559014 is about 278.3190701891.

The spelling of 21559014 in words is "twenty-one million, five hundred fifty-nine thousand, fourteen".