21334739 has 12 divisors (see below), whose sum is σ = 22759416. Its totient is φ = 19994688.

The previous prime is 21334723. The next prime is 21334759. The reversal of 21334739 is 93743312.

It is not a de Polignac number, because 21334739 - 2⁴ = 21334723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21334759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40532 + ... + 41054.

It is an arithmetic number, because the mean of its divisors is an integer number (1896618).

Almost surely, 2^21334739 is an apocalyptic number.

21334739 is a deficient number, since it is larger than the sum of its proper divisors (1424677).

21334739 is a wasteful number, since it uses less digits than its factorization.

21334739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 655 counting only the distinct ones).

The product of its digits is 13608, while the sum is 32.

The square root of 21334739 is about 4618.9543188908. The cubic root of 21334739 is about 277.3506010742.

The spelling of 21334739 in words is "twenty-one million, three hundred thirty-four thousand, seven hundred thirty-nine".