21341239 has 4 divisors (see below), whose sum is σ = 22596624. Its totient is φ = 20085856.

The previous prime is 21341191. The next prime is 21341249. The reversal of 21341239 is 93214312.

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 21341239 - 2¹³ = 21333047 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 (21341249) 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, 627667 + ... + 627700.

It is an arithmetic number, because the mean of its divisors is an integer number (5649156).

Almost surely, 2^21341239 is an apocalyptic number.

21341239 is a deficient number, since it is larger than the sum of its proper divisors (1255385).

21341239 is a wasteful number, since it uses less digits than its factorization.

21341239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255384.

The product of its digits is 1296, while the sum is 25.

The square root of 21341239 is about 4619.6578877661. The cubic root of 21341239 is about 277.3787647787.

The spelling of 21341239 in words is "twenty-one million, three hundred forty-one thousand, two hundred thirty-nine".