21147831882 has 24 divisors (see below), whose sum is σ = 45849754080. Its totient is φ = 7044746280.

The previous prime is 21147831863. The next prime is 21147831883. The reversal of 21147831882 is 28813874112.

21147831882 is a `hidden beast` number, since 211 + 47 + 8 + 318 + 82 = 666.

It is not an unprimeable number, because it can be changed into a prime (21147831883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348744 + ... + 404867.

It is an arithmetic number, because the mean of its divisors is an integer number (1910406420).

Almost surely, 2^21147831882 is an apocalyptic number.

21147831882 is an abundant number, since it is smaller than the sum of its proper divisors (24701922198).

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

21147831882 is a wasteful number, since it uses less digits than its factorization.

21147831882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755178 (or 755175 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The spelling of 21147831882 in words is "twenty-one billion, one hundred forty-seven million, eight hundred thirty-one thousand, eight hundred eighty-two".