21198782682 has 72 divisors (see below), whose sum is σ = 58286846592. Its totient is φ = 5506174800.

The previous prime is 21198782677. The next prime is 21198782719. The reversal of 21198782682 is 28628789112.

It is a super-2 number, since 2×21198782682² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 1082794 + ... + 1102197.

It is an arithmetic number, because the mean of its divisors is an integer number (809539536).

Almost surely, 2^21198782682 is an apocalyptic number.

21198782682 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21198782682 is an abundant number, since it is smaller than the sum of its proper divisors (37088063910).

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

21198782682 is a wasteful number, since it uses less digits than its factorization.

21198782682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185024 (or 2185014 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The spelling of 21198782682 in words is "twenty-one billion, one hundred ninety-eight million, seven hundred eighty-two thousand, six hundred eighty-two".