21132053 has 4 divisors (see below), whose sum is σ = 21208620. Its totient is φ = 21055488.

The previous prime is 21132011. The next prime is 21132061. The reversal of 21132053 is 35023112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2486929 + 18645124 = 1577^2 + 4318^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132053 - 2⁶ = 21131989 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 (21132953) 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, 37868 + ... + 38421.

It is an arithmetic number, because the mean of its divisors is an integer number (5302155).

Almost surely, 2^21132053 is an apocalyptic number.

It is an amenable number.

21132053 is a deficient number, since it is larger than the sum of its proper divisors (76567).

21132053 is an equidigital number, since it uses as much as digits as its factorization.

21132053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76566.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21132053 is about 4596.9612789320. The cubic root of 21132053 is about 276.4695021119.

Adding to 21132053 its reverse (35023112), we get a palindrome (56155165).

The spelling of 21132053 in words is "twenty-one million, one hundred thirty-two thousand, fifty-three".