21587007 has 8 divisors (see below), whose sum is σ = 30996784. Its totient is φ = 13284288.

The previous prime is 21586997. The next prime is 21587017. The reversal of 21587007 is 70078512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21586997) and next prime (21587017).

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

It is not a de Polignac number, because 21587007 - 2⁷ = 21586879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21587017) 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, 276718 + ... + 276795.

It is an arithmetic number, because the mean of its divisors is an integer number (3874598).

Almost surely, 2^21587007 is an apocalyptic number.

21587007 is a deficient number, since it is larger than the sum of its proper divisors (9409777).

21587007 is a wasteful number, since it uses less digits than its factorization.

21587007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553529.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 21587007 is about 4646.1819809388. The cubic root of 21587007 is about 278.4394779241.

The spelling of 21587007 in words is "twenty-one million, five hundred eighty-seven thousand, seven".