21134917 has 4 divisors (see below), whose sum is σ = 21179520. Its totient is φ = 21090316.

The previous prime is 21134903. The next prime is 21134923. The reversal of 21134917 is 71943112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21134917 - 2¹¹ = 21132869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134987) 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, 21583 + ... + 22540.

It is an arithmetic number, because the mean of its divisors is an integer number (5294880).

Almost surely, 2^21134917 is an apocalyptic number.

It is an amenable number.

21134917 is a deficient number, since it is larger than the sum of its proper divisors (44603).

21134917 is an equidigital number, since it uses as much as digits as its factorization.

21134917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44602.

The product of its digits is 1512, while the sum is 28.

The square root of 21134917 is about 4597.2727785068. The cubic root of 21134917 is about 276.4819913998.

The spelling of 21134917 in words is "twenty-one million, one hundred thirty-four thousand, nine hundred seventeen".