21573858082 has 24 divisors (see below), whose sum is σ = 37680178320. Its totient is φ = 9237097800.

The previous prime is 21573858077. The next prime is 21573858091. The reversal of 21573858082 is 28085837512.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1732 + ... + 207727.

It is an arithmetic number, because the mean of its divisors is an integer number (1570007430).

Almost surely, 2^21573858082 is an apocalyptic number.

21573858082 is a deficient number, since it is larger than the sum of its proper divisors (16106320238).

21573858082 is a wasteful number, since it uses less digits than its factorization.

21573858082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210526 (or 210519 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 21573858082 in words is "twenty-one billion, five hundred seventy-three million, eight hundred fifty-eight thousand, eighty-two".