21727034 has 16 divisors (see below), whose sum is σ = 37473408. Its totient is φ = 9254832.

The previous prime is 21727009. The next prime is 21727081. The reversal of 21727034 is 43072712.

It is a junction number, because it is equal to n+sod(n) for n = 21726994 and 21727012.

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 7 ways as a sum of consecutive naturals, for example, 2309 + ... + 6984.

It is an arithmetic number, because the mean of its divisors is an integer number (2342088).

Almost surely, 2^21727034 is an apocalyptic number.

21727034 is a deficient number, since it is larger than the sum of its proper divisors (15746374).

21727034 is a wasteful number, since it uses less digits than its factorization.

21727034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9469.

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

The square root of 21727034 is about 4661.2266625857. The cubic root of 21727034 is about 279.0402257832.

Adding to 21727034 its reverse (43072712), we get a palindrome (64799746).

The spelling of 21727034 in words is "twenty-one million, seven hundred twenty-seven thousand, thirty-four".