21027735 has 32 divisors (see below), whose sum is σ = 37752000. Its totient is φ = 11104128.

The previous prime is 21027709. The next prime is 21027767. The reversal of 21027735 is 53772012.

It is not a de Polignac number, because 21027735 - 2⁷ = 21027607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21027699 and 21027708.

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 31 ways as a sum of consecutive naturals, for example, 14001 + ... + 15429.

It is an arithmetic number, because the mean of its divisors is an integer number (1179750).

Almost surely, 2^21027735 is an apocalyptic number.

21027735 is a deficient number, since it is larger than the sum of its proper divisors (16724265).

21027735 is a wasteful number, since it uses less digits than its factorization.

21027735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21027735 is about 4585.6008330425. The cubic root of 21027735 is about 276.0138225591.

Adding to 21027735 its reverse (53772012), we get a palindrome (74799747).

The spelling of 21027735 in words is "twenty-one million, twenty-seven thousand, seven hundred thirty-five".