21145053 has 16 divisors (see below), whose sum is σ = 29022336. Its totient is φ = 13685760.

The previous prime is 21145051. The next prime is 21145063. The reversal of 21145053 is 35054112.

It is not a de Polignac number, because 21145053 - 2¹ = 21145051 is a prime.

It is a super-2 number, since 2×21145053² = 894226532745618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145051) 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, 43176 + ... + 43662.

It is an arithmetic number, because the mean of its divisors is an integer number (1813896).

Almost surely, 2^21145053 is an apocalyptic number.

It is an amenable number.

21145053 is a deficient number, since it is larger than the sum of its proper divisors (7877283).

21145053 is a wasteful number, since it uses less digits than its factorization.

21145053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21145053 is about 4598.3750390763. The cubic root of 21145053 is about 276.5261832552.

Adding to 21145053 its reverse (35054112), we get a palindrome (56199165).

The spelling of 21145053 in words is "twenty-one million, one hundred forty-five thousand, fifty-three".