21587122 has 16 divisors (see below), whose sum is σ = 33033600. Its totient is φ = 10577952.

The previous prime is 21587101. The next prime is 21587131. The reversal of 21587122 is 22178512.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 28683 + ... + 29425.

It is an arithmetic number, because the mean of its divisors is an integer number (2064600).

Almost surely, 2^21587122 is an apocalyptic number.

21587122 is a deficient number, since it is larger than the sum of its proper divisors (11446478).

21587122 is a wasteful number, since it uses less digits than its factorization.

21587122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017.

The product of its digits is 2240, while the sum is 28.

The square root of 21587122 is about 4646.1943566751. The cubic root of 21587122 is about 278.4399723648.

The spelling of 21587122 in words is "twenty-one million, five hundred eighty-seven thousand, one hundred twenty-two".