21148087 has 8 divisors (see below), whose sum is σ = 21882672. Its totient is φ = 20424000.

The previous prime is 21148079. The next prime is 21148123. The reversal of 21148087 is 78084112.

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 21148087 - 2³ = 21148079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148067) 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, 1588 + ... + 6694.

It is an arithmetic number, because the mean of its divisors is an integer number (2735334).

Almost surely, 2^21148087 is an apocalyptic number.

21148087 is a deficient number, since it is larger than the sum of its proper divisors (734585).

21148087 is a wasteful number, since it uses less digits than its factorization.

21148087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5249.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 21148087 is about 4598.7049263896. The cubic root of 21148087 is about 276.5394084181.

It can be divided in two parts, 2114 and 8087, that added together give a palindrome (10201).

The spelling of 21148087 in words is "twenty-one million, one hundred forty-eight thousand, eighty-seven".