21058653 has 16 divisors (see below), whose sum is σ = 35006976. Its totient is φ = 10939440.

The previous prime is 21058633. The next prime is 21058657. The reversal of 21058653 is 35685012.

It is not a de Polignac number, because 21058653 - 2⁵ = 21058621 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21058653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21058657) 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 15 ways as a sum of consecutive naturals, for example, 45351 + ... + 45812.

It is an arithmetic number, because the mean of its divisors is an integer number (2187936).

Almost surely, 2^21058653 is an apocalyptic number.

It is an amenable number.

21058653 is a deficient number, since it is larger than the sum of its proper divisors (13948323).

21058653 is a wasteful number, since it uses less digits than its factorization.

21058653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91184.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 21058653 is about 4588.9707996456. The cubic root of 21058653 is about 276.1490347165.

The spelling of 21058653 in words is "twenty-one million, fifty-eight thousand, six hundred fifty-three".