21034739 has 8 divisors (see below), whose sum is σ = 23336640. Its totient is φ = 18797800.

The previous prime is 21034733. The next prime is 21034747. The reversal of 21034739 is 93743012.

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 21034739 - 2⁴ = 21034723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15557 + ... + 16854.

It is an arithmetic number, because the mean of its divisors is an integer number (2917080).

Almost surely, 2^21034739 is an apocalyptic number.

21034739 is a deficient number, since it is larger than the sum of its proper divisors (2301901).

21034739 is a wasteful number, since it uses less digits than its factorization.

21034739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32481.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 21034739 is about 4586.3644643661. The cubic root of 21034739 is about 276.0444644109.

The spelling of 21034739 in words is "twenty-one million, thirty-four thousand, seven hundred thirty-nine".