21170457282 has 24 divisors (see below), whose sum is σ = 45848448144. Its totient is φ = 6513986544.

The previous prime is 21170457271. The next prime is 21170457283. The reversal of 21170457282 is 28275407112.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 21170457282.

It is not an unprimeable number, because it can be changed into a prime (21170457283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10438068 + ... + 10440095.

It is an arithmetic number, because the mean of its divisors is an integer number (1910352006).

Almost surely, 2^21170457282 is an apocalyptic number.

21170457282 is an abundant number, since it is smaller than the sum of its proper divisors (24677990862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21170457282 is a wasteful number, since it uses less digits than its factorization.

21170457282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20878194 (or 20878181 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The spelling of 21170457282 in words is "twenty-one billion, one hundred seventy million, four hundred fifty-seven thousand, two hundred eighty-two".