21139327 has 8 divisors (see below), whose sum is σ = 23386752. Its totient is φ = 18946200.

The previous prime is 21139301. The next prime is 21139337. The reversal of 21139327 is 72393112.

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 21139327 - 2¹¹ = 21137279 is a prime.

It is a super-2 number, since 2×21139327² = 893742292025858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21139295 and 21139304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21139337) 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, 12753 + ... + 14314.

It is an arithmetic number, because the mean of its divisors is an integer number (2923344).

Almost surely, 2^21139327 is an apocalyptic number.

21139327 is a deficient number, since it is larger than the sum of its proper divisors (2247425).

21139327 is a wasteful number, since it uses less digits than its factorization.

21139327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27149.

The product of its digits is 2268, while the sum is 28.

The square root of 21139327 is about 4597.7523856772. The cubic root of 21139327 is about 276.5012202552.

The spelling of 21139327 in words is "twenty-one million, one hundred thirty-nine thousand, three hundred twenty-seven".