21023027 has 4 divisors (see below), whose sum is σ = 21056976. Its totient is φ = 20989080.

The previous prime is 21023017. The next prime is 21023047. The reversal of 21023027 is 72032012.

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

It is a cyclic number.

It is not a de Polignac number, because 21023027 - 2¹² = 21018931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022996 and 21023014.

It is not an unprimeable number, because it can be changed into a prime (21023017) 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, 16028 + ... + 17289.

It is an arithmetic number, because the mean of its divisors is an integer number (5264244).

Almost surely, 2^21023027 is an apocalyptic number.

21023027 is a deficient number, since it is larger than the sum of its proper divisors (33949).

21023027 is an equidigital number, since it uses as much as digits as its factorization.

21023027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33948.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 21023027 is about 4585.0874582717. The cubic root of 21023027 is about 275.9932216707.

Adding to 21023027 its reverse (72032012), we get a palindrome (93055039).

The spelling of 21023027 in words is "twenty-one million, twenty-three thousand, twenty-seven".