21652735 has 16 divisors (see below), whose sum is σ = 28153440. Its totient is φ = 15891840.

The previous prime is 21652727. The next prime is 21652751. The reversal of 21652735 is 53725612.

It is not a de Polignac number, because 21652735 - 2³ = 21652727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21652697 and 21652706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10705 + ... + 12565.

It is an arithmetic number, because the mean of its divisors is an integer number (1759590).

Almost surely, 2^21652735 is an apocalyptic number.

21652735 is the 2327-th decagonal number.

21652735 is a deficient number, since it is larger than the sum of its proper divisors (6500705).

21652735 is a wasteful number, since it uses less digits than its factorization.

21652735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058.

The product of its digits is 12600, while the sum is 31.

The square root of 21652735 is about 4653.2499395584. The cubic root of 21652735 is about 278.7217885879.

It can be divided in two parts, 2165 and 2735, that added together give a square (4900 = 70²).

The spelling of 21652735 in words is "twenty-one million, six hundred fifty-two thousand, seven hundred thirty-five".