21586742 has 16 divisors (see below), whose sum is σ = 34007040. Its totient is φ = 10257192.

The previous prime is 21586739. The next prime is 21586837. The reversal of 21586742 is 24768512.

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, 6059 + ... + 8937.

It is an arithmetic number, because the mean of its divisors is an integer number (2125440).

Almost surely, 2^21586742 is an apocalyptic number.

21586742 is a deficient number, since it is larger than the sum of its proper divisors (12420298).

21586742 is a wasteful number, since it uses less digits than its factorization.

21586742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3067.

The product of its digits is 26880, while the sum is 35.

The square root of 21586742 is about 4646.1534628120. The cubic root of 21586742 is about 278.4383385541.

The spelling of 21586742 in words is "twenty-one million, five hundred eighty-six thousand, seven hundred forty-two".