21385592 has 16 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 10063744.

The previous prime is 21385591. The next prime is 21385597. The reversal of 21385592 is 29558312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78488 + ... + 78759.

It is an arithmetic number, because the mean of its divisors is an integer number (2653560).

Almost surely, 2^21385592 is an apocalyptic number.

It is an amenable number.

21385592 is a deficient number, since it is larger than the sum of its proper divisors (21071368).

21385592 is a wasteful number, since it uses less digits than its factorization.

21385592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157270 (or 157266 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 21385592 is about 4624.4558598823. The cubic root of 21385592 is about 277.5707884230.

The spelling of 21385592 in words is "twenty-one million, three hundred eighty-five thousand, five hundred ninety-two".