21480513 has 8 divisors (see below), whose sum is σ = 28682400. Its totient is φ = 14299488.

The previous prime is 21480499. The next prime is 21480541. The reversal of 21480513 is 31508412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21480513 - 2⁴ = 21480497 is a prime.

It is a super-2 number, since 2×21480513² = 922824877486338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21480593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2628 + ... + 7061.

It is an arithmetic number, because the mean of its divisors is an integer number (3585300).

Almost surely, 2^21480513 is an apocalyptic number.

It is an amenable number.

21480513 is a deficient number, since it is larger than the sum of its proper divisors (7201887).

21480513 is an equidigital number, since it uses as much as digits as its factorization.

21480513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10431.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21480513 is about 4634.7074341322. The cubic root of 21480513 is about 277.9808528469.

Adding to 21480513 its reverse (31508412), we get a palindrome (52988925).

The spelling of 21480513 in words is "twenty-one million, four hundred eighty thousand, five hundred thirteen".