21170734 has 32 divisors (see below), whose sum is σ = 35814240. Its totient is φ = 9320832.

The previous prime is 21170717. The next prime is 21170753. The reversal of 21170734 is 43707112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21170699 and 21170708.

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, 56572 + ... + 56944.

It is an arithmetic number, because the mean of its divisors is an integer number (1119195).

Almost surely, 2^21170734 is an apocalyptic number.

21170734 is a deficient number, since it is larger than the sum of its proper divisors (14643506).

21170734 is a wasteful number, since it uses less digits than its factorization.

21170734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21170734 is about 4601.1665912027. The cubic root of 21170734 is about 276.6380864334.

Adding to 21170734 its reverse (43707112), we get a palindrome (64877846).

It can be divided in two parts, 21170 and 734, that added together give a square (21904 = 148²).

The spelling of 21170734 in words is "twenty-one million, one hundred seventy thousand, seven hundred thirty-four".