21653702 has 16 divisors (see below), whose sum is σ = 37370112. Its totient is φ = 9217800.

The previous prime is 21653677. The next prime is 21653707. The reversal of 21653702 is 20735612.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653707) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 3008 + ... + 7235.

It is an arithmetic number, because the mean of its divisors is an integer number (2335632).

Almost surely, 2^21653702 is an apocalyptic number.

21653702 is a deficient number, since it is larger than the sum of its proper divisors (15716410).

21653702 is a wasteful number, since it uses less digits than its factorization.

21653702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10403.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21653702 is about 4653.3538442719. The cubic root of 21653702 is about 278.7259377166.

The spelling of 21653702 in words is "twenty-one million, six hundred fifty-three thousand, seven hundred two".