21676734 has 60 divisors (see below), whose sum is σ = 51708624. Its totient is φ = 6785856.

The previous prime is 21676703. The next prime is 21676747. The reversal of 21676734 is 43767612.

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 29 ways as a sum of consecutive naturals, for example, 46587 + ... + 47049.

Almost surely, 2^21676734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21676734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25854312).

21676734 is an abundant number, since it is smaller than the sum of its proper divisors (30031890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21676734 is a wasteful number, since it uses less digits than its factorization.

21676734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511 (or 485 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 21676734 is about 4655.8279607391. The cubic root of 21676734 is about 278.8247251520.

The spelling of 21676734 in words is "twenty-one million, six hundred seventy-six thousand, seven hundred thirty-four".