21546734 has 16 divisors (see below), whose sum is σ = 35611056. Its totient is φ = 9696000.

The previous prime is 21546719. The next prime is 21546737. The reversal of 21546734 is 43764512.

It is a self number, because there is not a number n which added to its sum of digits gives 21546734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21546737) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2627 + ... + 7070.

It is an arithmetic number, because the mean of its divisors is an integer number (2225691).

Almost surely, 2^21546734 is an apocalyptic number.

21546734 is a deficient number, since it is larger than the sum of its proper divisors (14064322).

21546734 is a wasteful number, since it uses less digits than its factorization.

21546734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9811.

The product of its digits is 20160, while the sum is 32.

The square root of 21546734 is about 4641.8459690085. The cubic root of 21546734 is about 278.2662167005.

It can be divided in two parts, 2154 and 6734, that added together give a palindrome (8888).

The spelling of 21546734 in words is "twenty-one million, five hundred forty-six thousand, seven hundred thirty-four".