21427063 has 6 divisors (see below), whose sum is σ = 24925416. Its totient is φ = 18366012.

The previous prime is 21427039. The next prime is 21427073. The reversal of 21427063 is 36072412.

It is not a de Polignac number, because 21427063 - 2²¹ = 19329911 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 (21427013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218595 + ... + 218692.

It is an arithmetic number, because the mean of its divisors is an integer number (4154236).

Almost surely, 2^21427063 is an apocalyptic number.

21427063 is a deficient number, since it is larger than the sum of its proper divisors (3498353).

21427063 is an equidigital number, since it uses as much as digits as its factorization.

21427063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437301 (or 437294 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21427063 is about 4628.9375670882. The cubic root of 21427063 is about 277.7500945864.

Adding to 21427063 its reverse (36072412), we get a palindrome (57499475).

The spelling of 21427063 in words is "twenty-one million, four hundred twenty-seven thousand, sixty-three".