21227569 has 4 divisors (see below), whose sum is σ = 23157360. Its totient is φ = 19297780.

The previous prime is 21227567. The next prime is 21227581. The reversal of 21227569 is 96572212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21227569 - 2¹ = 21227567 is a prime.

It is a super-2 number, since 2×21227569² = 901219371299522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21227561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964879 + ... + 964900.

It is an arithmetic number, because the mean of its divisors is an integer number (5789340).

Almost surely, 2^21227569 is an apocalyptic number.

It is an amenable number.

21227569 is a deficient number, since it is larger than the sum of its proper divisors (1929791).

21227569 is a wasteful number, since it uses less digits than its factorization.

21227569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929790.

The product of its digits is 15120, while the sum is 34.

The square root of 21227569 is about 4607.3386027076. The cubic root of 21227569 is about 276.8854196440.

The spelling of 21227569 in words is "twenty-one million, two hundred twenty-seven thousand, five hundred sixty-nine".