21784935074 has 16 divisors (see below), whose sum is σ = 37347611328. Its totient is φ = 9335898672.

The previous prime is 21784935059. The next prime is 21784935077. The reversal of 21784935074 is 47053948712.

It is not an unprimeable number, because it can be changed into a prime (21784935077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362609 + ... + 418395.

It is an arithmetic number, because the mean of its divisors is an integer number (2334225708).

Almost surely, 2^21784935074 is an apocalyptic number.

21784935074 is a deficient number, since it is larger than the sum of its proper divisors (15562676254).

21784935074 is a wasteful number, since it uses less digits than its factorization.

21784935074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83689.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 21784935074 in words is "twenty-one billion, seven hundred eighty-four million, nine hundred thirty-five thousand, seventy-four".