21480053 has 4 divisors (see below), whose sum is σ = 24548640. Its totient is φ = 18411468.

The previous prime is 21480049. The next prime is 21480059. The reversal of 21480053 is 35008412.

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 21480053 - 2² = 21480049 is a prime.

It is a super-2 number, since 2×21480053² = 922785353765618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480059) 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, 1534283 + ... + 1534296.

It is an arithmetic number, because the mean of its divisors is an integer number (6137160).

Almost surely, 2^21480053 is an apocalyptic number.

It is an amenable number.

21480053 is a deficient number, since it is larger than the sum of its proper divisors (3068587).

21480053 is an equidigital number, since it uses as much as digits as its factorization.

21480053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068586.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21480053 is about 4634.6578082961. The cubic root of 21480053 is about 277.9788685351.

Adding to 21480053 its reverse (35008412), we get a palindrome (56488465).

The spelling of 21480053 in words is "twenty-one million, four hundred eighty thousand, fifty-three".