21083151 has 4 divisors (see below), whose sum is σ = 28110872. Its totient is φ = 14055432.

The previous prime is 21083147. The next prime is 21083159. The reversal of 21083151 is 15138012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21083151 - 2² = 21083147 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 (21083159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3513856 + ... + 3513861.

It is an arithmetic number, because the mean of its divisors is an integer number (7027718).

Almost surely, 2^21083151 is an apocalyptic number.

21083151 is a deficient number, since it is larger than the sum of its proper divisors (7027721).

21083151 is an equidigital number, since it uses as much as digits as its factorization.

21083151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7027720.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 21083151 is about 4591.6392497669. The cubic root of 21083151 is about 276.2560766597.

The spelling of 21083151 in words is "twenty-one million, eighty-three thousand, one hundred fifty-one".