21034927 has 4 divisors (see below), whose sum is σ = 21548016. Its totient is φ = 20521840.

The previous prime is 21034891. The next prime is 21034943. The reversal of 21034927 is 72943012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034927 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21034895 and 21034904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034997) 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, 256483 + ... + 256564.

It is an arithmetic number, because the mean of its divisors is an integer number (5387004).

Almost surely, 2^21034927 is an apocalyptic number.

21034927 is a deficient number, since it is larger than the sum of its proper divisors (513089).

21034927 is an equidigital number, since it uses as much as digits as its factorization.

21034927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513088.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21034927 is about 4586.3849598567. The cubic root of 21034927 is about 276.0452867997.

Adding to 21034927 its reverse (72943012), we get a palindrome (93977939).

The spelling of 21034927 in words is "twenty-one million, thirty-four thousand, nine hundred twenty-seven".