21273053 has 4 divisors (see below), whose sum is σ = 21303360. Its totient is φ = 21242748.

The previous prime is 21273023. The next prime is 21273061. The reversal of 21273053 is 35037212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21273053 - 2¹⁸ = 21010909 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21273013) 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 3 ways as a sum of consecutive naturals, for example, 14075 + ... + 15512.

It is an arithmetic number, because the mean of its divisors is an integer number (5325840).

Almost surely, 2^21273053 is an apocalyptic number.

It is an amenable number.

21273053 is a deficient number, since it is larger than the sum of its proper divisors (30307).

21273053 is an equidigital number, since it uses as much as digits as its factorization.

21273053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30306.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21273053 is about 4612.2719997849. The cubic root of 21273053 is about 277.0830380057.

The spelling of 21273053 in words is "twenty-one million, two hundred seventy-three thousand, fifty-three".