21041927 has 4 divisors (see below), whose sum is σ = 21051576. Its totient is φ = 21032280.

The previous prime is 21041879. The next prime is 21041981. The reversal of 21041927 is 72914012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21041927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21041896 and 21041905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (5262894).

Almost surely, 2^21041927 is an apocalyptic number.

21041927 is a deficient number, since it is larger than the sum of its proper divisors (9649).

21041927 is an equidigital number, since it uses as much as digits as its factorization.

21041927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9648.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 21041927 is about 4587.1480246445. The cubic root of 21041927 is about 276.0759041741.

Adding to 21041927 its reverse (72914012), we get a palindrome (93955939).

The spelling of 21041927 in words is "twenty-one million, forty-one thousand, nine hundred twenty-seven".