21134739 has 8 divisors (see below), whose sum is σ = 28200960. Its totient is φ = 14079176.

The previous prime is 21134717. The next prime is 21134749. The reversal of 21134739 is 93743112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21134739 - 2⁷ = 21134611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21134749) by changing a digit.

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, 5902 + ... + 8780.

It is an arithmetic number, because the mean of its divisors is an integer number (3525120).

Almost surely, 2^21134739 is an apocalyptic number.

21134739 is a deficient number, since it is larger than the sum of its proper divisors (7066221).

21134739 is a wasteful number, since it uses less digits than its factorization.

21134739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5329.

The product of its digits is 4536, while the sum is 30.

The square root of 21134739 is about 4597.2534191624. The cubic root of 21134739 is about 276.4812152130.

The spelling of 21134739 in words is "twenty-one million, one hundred thirty-four thousand, seven hundred thirty-nine".