21870327 has 8 divisors (see below), whose sum is σ = 29183616. Its totient is φ = 14568632.

The previous prime is 21870323. The next prime is 21870337. The reversal of 21870327 is 72307812.

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 21870327 - 2² = 21870323 is a prime.

It is a super-2 number, since 2×21870327² = 956622406173858, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 21870294 and 21870303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21870323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3568 + ... + 7514.

It is an arithmetic number, because the mean of its divisors is an integer number (3647952).

Almost surely, 2^21870327 is an apocalyptic number.

21870327 is a deficient number, since it is larger than the sum of its proper divisors (7313289).

21870327 is a wasteful number, since it uses less digits than its factorization.

21870327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5797.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 21870327 is about 4676.5721420716. The cubic root of 21870327 is about 279.6523193081.

The spelling of 21870327 in words is "twenty-one million, eight hundred seventy thousand, three hundred twenty-seven".