21480113 has 4 divisors (see below), whose sum is σ = 21832308. Its totient is φ = 21127920.

The previous prime is 21480101. The next prime is 21480131. The reversal of 21480113 is 31108412.

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 11888704 + 9591409 = 3448^2 + 3097^2 .

It is a cyclic number.

It is not a de Polignac number, because 21480113 - 2⁶ = 21480049 is a prime.

It is a super-2 number, since 2×21480113² = 922790508985538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21480713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176006 + ... + 176127.

It is an arithmetic number, because the mean of its divisors is an integer number (5458077).

Almost surely, 2^21480113 is an apocalyptic number.

It is an amenable number.

21480113 is a deficient number, since it is larger than the sum of its proper divisors (352195).

21480113 is an equidigital number, since it uses as much as digits as its factorization.

21480113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352194.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21480113 is about 4634.6642812614. The cubic root of 21480113 is about 277.9791273600.

Adding to 21480113 its reverse (31108412), we get a palindrome (52588525).

The spelling of 21480113 in words is "twenty-one million, four hundred eighty thousand, one hundred thirteen".