21683917934 has 8 divisors (see below), whose sum is σ = 37172430768. Its totient is φ = 9293107680.

The previous prime is 21683917933. The next prime is 21683917951. The reversal of 21683917934 is 43971938612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683917933) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 774425627 + ... + 774425654.

It is an arithmetic number, because the mean of its divisors is an integer number (4646553846).

Almost surely, 2^21683917934 is an apocalyptic number.

21683917934 is a deficient number, since it is larger than the sum of its proper divisors (15488512834).

21683917934 is a wasteful number, since it uses less digits than its factorization.

21683917934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548851290.

The product of its digits is 1959552, while the sum is 53.

The spelling of 21683917934 in words is "twenty-one billion, six hundred eighty-three million, nine hundred seventeen thousand, nine hundred thirty-four".