21587069 has 8 divisors (see below), whose sum is σ = 24783360. Its totient is φ = 18418896.

The previous prime is 21587057. The next prime is 21587077. The reversal of 21587069 is 96078512.

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

It is a cyclic number.

It is not a de Polignac number, because 21587069 - 2¹² = 21582973 is a prime.

It is a super-2 number, since 2×21587069² = 932003096021522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21587089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5354 + ... + 8475.

It is an arithmetic number, because the mean of its divisors is an integer number (3097920).

Almost surely, 2^21587069 is an apocalyptic number.

It is an amenable number.

21587069 is a deficient number, since it is larger than the sum of its proper divisors (3196291).

21587069 is a wasteful number, since it uses less digits than its factorization.

21587069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14059.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 21587069 is about 4646.1886530790. The cubic root of 21587069 is about 278.4397444923.

The spelling of 21587069 in words is "twenty-one million, five hundred eighty-seven thousand, sixty-nine".