21388614 has 16 divisors (see below), whose sum is σ = 46067952. Its totient is φ = 6581088.

The previous prime is 21388607. The next prime is 21388639. The reversal of 21388614 is 41688312.

It is a congruent number.

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, 137029 + ... + 137184.

It is an arithmetic number, because the mean of its divisors is an integer number (2879247).

Almost surely, 2^21388614 is an apocalyptic number.

21388614 is an abundant number, since it is smaller than the sum of its proper divisors (24679338).

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

21388614 is a wasteful number, since it uses less digits than its factorization.

21388614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274231.

The product of its digits is 9216, while the sum is 33.

The square root of 21388614 is about 4624.7825894846. The cubic root of 21388614 is about 277.5838623252.

The spelling of 21388614 in words is "twenty-one million, three hundred eighty-eight thousand, six hundred fourteen".