21027734 has 32 divisors (see below), whose sum is σ = 40083456. Its totient is φ = 8048160.

The previous prime is 21027709. The next prime is 21027767. The reversal of 21027734 is 43772012.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 3779 + ... + 7505.

It is an arithmetic number, because the mean of its divisors is an integer number (1252608).

Almost surely, 2^21027734 is an apocalyptic number.

21027734 is a deficient number, since it is larger than the sum of its proper divisors (19055722).

21027734 is a wasteful number, since it uses less digits than its factorization.

21027734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 21027734 is about 4585.6007240055. The cubic root of 21027734 is about 276.0138181838.

Adding to 21027734 its reverse (43772012), we get a palindrome (64799746).

The spelling of 21027734 in words is "twenty-one million, twenty-seven thousand, seven hundred thirty-four".