21480986 has 4 divisors (see below), whose sum is σ = 32221482. Its totient is φ = 10740492.

The previous prime is 21480973. The next prime is 21480997. The reversal of 21480986 is 68908412.

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

It can be written as a sum of positive squares in only one way, i.e., 11015761 + 10465225 = 3319^2 + 3235^2 .

It is a super-2 number, since 2×21480986² = 922865519064392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5370245 + ... + 5370248.

Almost surely, 2^21480986 is an apocalyptic number.

21480986 is a deficient number, since it is larger than the sum of its proper divisors (10740496).

21480986 is a wasteful number, since it uses less digits than its factorization.

21480986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10740495.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21480986 is about 4634.7584618834. The cubic root of 21480986 is about 277.9828932075.

The spelling of 21480986 in words is "twenty-one million, four hundred eighty thousand, nine hundred eighty-six".