21034729683 has 12 divisors (see below), whose sum is σ = 33145634808. Its totient is φ = 12748320960.

The previous prime is 21034729601. The next prime is 21034729687. The reversal of 21034729683 is 38692743012.

21034729683 is a `hidden beast` number, since 2 + 10 + 3 + 472 + 96 + 83 = 666.

It is not a de Polignac number, because 21034729683 - 2³² = 16739762387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21034729687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106235910 + ... + 106236107.

It is an arithmetic number, because the mean of its divisors is an integer number (2762136234).

Almost surely, 2^21034729683 is an apocalyptic number.

21034729683 is a deficient number, since it is larger than the sum of its proper divisors (12110905125).

21034729683 is a wasteful number, since it uses less digits than its factorization.

21034729683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212472034 (or 212472031 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 21034729683 in words is "twenty-one billion, thirty-four million, seven hundred twenty-nine thousand, six hundred eighty-three".