21140339 has 4 divisors (see below), whose sum is σ = 23062200. Its totient is φ = 19218480.

The previous prime is 21140303. The next prime is 21140341. The reversal of 21140339 is 93304112.

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

It is a cyclic number.

It is not a de Polignac number, because 21140339 - 2¹⁶ = 21074803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140389) 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, 960914 + ... + 960935.

It is an arithmetic number, because the mean of its divisors is an integer number (5765550).

Almost surely, 2^21140339 is an apocalyptic number.

21140339 is a deficient number, since it is larger than the sum of its proper divisors (1921861).

21140339 is a wasteful number, since it uses less digits than its factorization.

21140339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921860.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21140339 is about 4597.8624381336. The cubic root of 21140339 is about 276.5056324860.

The spelling of 21140339 in words is "twenty-one million, one hundred forty thousand, three hundred thirty-nine".