21487083 has 8 divisors (see below), whose sum is σ = 29895168. Its totient is φ = 13701864.

The previous prime is 21487079. The next prime is 21487087. The reversal of 21487083 is 38078412.

It is an interprime number because it is at equal distance from previous prime (21487079) and next prime (21487087).

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

It is not a de Polignac number, because 21487083 - 2² = 21487079 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21487087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155635 + ... + 155772.

It is an arithmetic number, because the mean of its divisors is an integer number (3736896).

Almost surely, 2^21487083 is an apocalyptic number.

21487083 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21487083 is a deficient number, since it is larger than the sum of its proper divisors (8408085).

21487083 is a wasteful number, since it uses less digits than its factorization.

21487083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311433.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 21487083 is about 4635.4161625468. The cubic root of 21487083 is about 278.0091909043.

The spelling of 21487083 in words is "twenty-one million, four hundred eighty-seven thousand, eighty-three".