21480430 has 8 divisors (see below), whose sum is σ = 38664792. Its totient is φ = 8592168.

The previous prime is 21480397. The next prime is 21480439. The reversal of 21480430 is 3408412.

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

It is a super-2 number, since 2×21480430² = 922817745969800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480439) 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, 1074012 + ... + 1074031.

It is an arithmetic number, because the mean of its divisors is an integer number (4833099).

Almost surely, 2^21480430 is an apocalyptic number.

21480430 is a deficient number, since it is larger than the sum of its proper divisors (17184362).

21480430 is a wasteful number, since it uses less digits than its factorization.

21480430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148050.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21480430 is about 4634.6984799445. The cubic root of 21480430 is about 277.9804948101.

Adding to 21480430 its reverse (3408412), we get a palindrome (24888842).

The spelling of 21480430 in words is "twenty-one million, four hundred eighty thousand, four hundred thirty".