21270327 has 16 divisors (see below), whose sum is σ = 30914688. Its totient is φ = 12929760.

The previous prime is 21270323. The next prime is 21270373. The reversal of 21270327 is 72307212.

It is not a de Polignac number, because 21270327 - 2² = 21270323 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21270297 and 21270306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49 + ... + 6522.

It is an arithmetic number, because the mean of its divisors is an integer number (1932168).

Almost surely, 2^21270327 is an apocalyptic number.

21270327 is a deficient number, since it is larger than the sum of its proper divisors (9644361).

21270327 is a wasteful number, since it uses less digits than its factorization.

21270327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21270327 is about 4611.9764743546. The cubic root of 21270327 is about 277.0712020518.

Adding to 21270327 its product of nonzero digits (1176), we get a triangular number (21271503 = T₆₅₂₂).

Adding to 21270327 its reverse (72307212), we get a palindrome (93577539).

The spelling of 21270327 in words is "twenty-one million, two hundred seventy thousand, three hundred twenty-seven".