21227027 has 4 divisors (see below), whose sum is σ = 21243600. Its totient is φ = 21210456.

The previous prime is 21227023. The next prime is 21227081. The reversal of 21227027 is 72072212.

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 21227027 - 2² = 21227023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21226993 and 21227011.

It is not an unprimeable number, because it can be changed into a prime (21227023) 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, 6188 + ... + 8985.

It is an arithmetic number, because the mean of its divisors is an integer number (5310900).

Almost surely, 2^21227027 is an apocalyptic number.

21227027 is a deficient number, since it is larger than the sum of its proper divisors (16573).

21227027 is a wasteful number, since it uses less digits than its factorization.

21227027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16572.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 21227027 is about 4607.2797831258. The cubic root of 21227027 is about 276.8830630674.

Adding to 21227027 its reverse (72072212), we get a palindrome (93299239).

The spelling of 21227027 in words is "twenty-one million, two hundred twenty-seven thousand, twenty-seven".