21082053 has 16 divisors (see below), whose sum is σ = 29669760. Its totient is φ = 13288704.

The previous prime is 21082021. The next prime is 21082063. The reversal of 21082053 is 35028012.

It is not a de Polignac number, because 21082053 - 2⁵ = 21082021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082003) 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 15 ways as a sum of consecutive naturals, for example, 4425 + ... + 7857.

It is an arithmetic number, because the mean of its divisors is an integer number (1854360).

Almost surely, 2^21082053 is an apocalyptic number.

21082053 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21082053 is a deficient number, since it is larger than the sum of its proper divisors (8587707).

21082053 is a wasteful number, since it uses less digits than its factorization.

21082053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21082053 is about 4591.5196830679. The cubic root of 21082053 is about 276.2512808169.

The spelling of 21082053 in words is "twenty-one million, eighty-two thousand, fifty-three".