21485087 has 8 divisors (see below), whose sum is σ = 23575104. Its totient is φ = 19457568.

The previous prime is 21485083. The next prime is 21485089. The reversal of 21485087 is 78058412.

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

It is not a de Polignac number, because 21485087 - 2² = 21485083 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 (21485083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14903 + ... + 16280.

It is an arithmetic number, because the mean of its divisors is an integer number (2946888).

Almost surely, 2^21485087 is an apocalyptic number.

21485087 is a deficient number, since it is larger than the sum of its proper divisors (2090017).

21485087 is a wasteful number, since it uses less digits than its factorization.

21485087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31249.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 21485087 is about 4635.2008586468. The cubic root of 21485087 is about 278.0005822668. Note that the first 3 decimals are identical.

The spelling of 21485087 in words is "twenty-one million, four hundred eighty-five thousand, eighty-seven".