21160587 has 8 divisors (see below), whose sum is σ = 32244736. Its totient is φ = 12091752.

The previous prime is 21160577. The next prime is 21160591. The reversal of 21160587 is 78506112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21160587 - 2⁴ = 21160571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21160577) 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 7 ways as a sum of consecutive naturals, for example, 503803 + ... + 503844.

It is an arithmetic number, because the mean of its divisors is an integer number (4030592).

Almost surely, 2^21160587 is an apocalyptic number.

21160587 is a deficient number, since it is larger than the sum of its proper divisors (11084149).

21160587 is a wasteful number, since it uses less digits than its factorization.

21160587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007657.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 21160587 is about 4600.0638039053. The cubic root of 21160587 is about 276.5938824039.

Adding to 21160587 its reverse (78506112), we get a palindrome (99666699).

The spelling of 21160587 in words is "twenty-one million, one hundred sixty thousand, five hundred eighty-seven".