21480518 has 4 divisors (see below), whose sum is σ = 32220780. Its totient is φ = 10740258.

The previous prime is 21480499. The next prime is 21480541. The reversal of 21480518 is 81508412.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21480518² = 922825307096648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5370128 + ... + 5370131.

It is an arithmetic number, because the mean of its divisors is an integer number (8055195).

Almost surely, 2^21480518 is an apocalyptic number.

21480518 is a deficient number, since it is larger than the sum of its proper divisors (10740262).

21480518 is a wasteful number, since it uses less digits than its factorization.

21480518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10740261.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 21480518 is about 4634.7079735405. The cubic root of 21480518 is about 277.9808744153.

The spelling of 21480518 in words is "twenty-one million, four hundred eighty thousand, five hundred eighteen".