21480135 has 16 divisors (see below), whose sum is σ = 34704384. Its totient is φ = 11344032.

The previous prime is 21480131. The next prime is 21480157. The reversal of 21480135 is 53108412.

It is not a de Polignac number, because 21480135 - 2² = 21480131 is a prime.

It is a super-2 number, since 2×21480135² = 922792399236450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480131) 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, 5407 + ... + 8496.

It is an arithmetic number, because the mean of its divisors is an integer number (2169024).

Almost surely, 2^21480135 is an apocalyptic number.

21480135 is a deficient number, since it is larger than the sum of its proper divisors (13224249).

21480135 is a wasteful number, since it uses less digits than its factorization.

21480135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14014.

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

The square root of 21480135 is about 4634.6666546797. Note that the first 4 decimals coincide. The cubic root of 21480135 is about 277.9792222623.

Adding to 21480135 its reverse (53108412), we get a palindrome (74588547).

The spelling of 21480135 in words is "twenty-one million, four hundred eighty thousand, one hundred thirty-five".