21702734 has 4 divisors (see below), whose sum is σ = 32554104. Its totient is φ = 10851366.

The previous prime is 21702719. The next prime is 21702809. The reversal of 21702734 is 43720712.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5425682 + ... + 5425685.

It is an arithmetic number, because the mean of its divisors is an integer number (8138526).

Almost surely, 2^21702734 is an apocalyptic number.

21702734 is a deficient number, since it is larger than the sum of its proper divisors (10851370).

21702734 is a wasteful number, since it uses less digits than its factorization.

21702734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10851369.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 21702734 is about 4658.6193233618. The cubic root of 21702734 is about 278.9361587034.

The spelling of 21702734 in words is "twenty-one million, seven hundred two thousand, seven hundred thirty-four".