21517480882 has 4 divisors (see below), whose sum is σ = 32276221326. Its totient is φ = 10758740440.

The previous prime is 21517480879. The next prime is 21517480889. The reversal of 21517480882 is 28808471512.

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., 16902860121 + 4614620761 = 130011^2 + 67931^2 .

It is not an unprimeable number, because it can be changed into a prime (21517480889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5379370219 + ... + 5379370222.

Almost surely, 2^21517480882 is an apocalyptic number.

21517480882 is a deficient number, since it is larger than the sum of its proper divisors (10758740444).

21517480882 is a wasteful number, since it uses less digits than its factorization.

21517480882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10758740443.

The product of its (nonzero) digits is 286720, while the sum is 46.

The spelling of 21517480882 in words is "twenty-one billion, five hundred seventeen million, four hundred eighty thousand, eight hundred eighty-two".