21198782675 has 12 divisors (see below), whose sum is σ = 30041703696. Its totient is φ = 14536308000.

The previous prime is 21198782653. The next prime is 21198782677. The reversal of 21198782675 is 57628789112.

It is not a de Polignac number, because 21198782675 - 2⁸ = 21198782419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21198782675.

It is not an unprimeable number, because it can be changed into a prime (21198782677) 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, 60567776 + ... + 60568125.

It is an arithmetic number, because the mean of its divisors is an integer number (2503475308).

Almost surely, 2^21198782675 is an apocalyptic number.

21198782675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21198782675 is a deficient number, since it is larger than the sum of its proper divisors (8842921021).

21198782675 is a wasteful number, since it uses less digits than its factorization.

21198782675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121135918 (or 121135913 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 56.

The spelling of 21198782675 in words is "twenty-one billion, one hundred ninety-eight million, seven hundred eighty-two thousand, six hundred seventy-five".