21929734 has 8 divisors (see below), whose sum is σ = 32924160. Its totient is φ = 10955016.

The previous prime is 21929723. The next prime is 21929749. The reversal of 21929734 is 43792912.

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

It is a junction number, because it is equal to n+sod(n) for n = 21929693 and 21929702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1729 + ... + 6844.

It is an arithmetic number, because the mean of its divisors is an integer number (4115520).

Almost surely, 2^21929734 is an apocalyptic number.

21929734 is a deficient number, since it is larger than the sum of its proper divisors (10994426).

21929734 is a wasteful number, since it uses less digits than its factorization.

21929734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854.

The product of its digits is 27216, while the sum is 37.

The square root of 21929734 is about 4682.9193885866. The cubic root of 21929734 is about 279.9052996071.

The spelling of 21929734 in words is "twenty-one million, nine hundred twenty-nine thousand, seven hundred thirty-four".