21152327 has 4 divisors (see below), whose sum is σ = 24174096. Its totient is φ = 18130560.

The previous prime is 21152321. The next prime is 21152333. The reversal of 21152327 is 72325112.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21152321) and next prime (21152333).

It is not a de Polignac number, because 21152327 - 2⁴ = 21152311 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 (21152321) 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, 1510874 + ... + 1510887.

It is an arithmetic number, because the mean of its divisors is an integer number (6043524).

Almost surely, 2^21152327 is an apocalyptic number.

21152327 is a deficient number, since it is larger than the sum of its proper divisors (3021769).

21152327 is an equidigital number, since it uses as much as digits as its factorization.

21152327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021768.

The product of its digits is 840, while the sum is 23.

The square root of 21152327 is about 4599.1659026393. The cubic root of 21152327 is about 276.5578883992.

Adding to 21152327 its reverse (72325112), we get a palindrome (93477439).

The spelling of 21152327 in words is "twenty-one million, one hundred fifty-two thousand, three hundred twenty-seven".