21227769 has 12 divisors (see below), whose sum is σ = 32276400. Its totient is φ = 13406904.

The previous prime is 21227753. The next prime is 21227779. The reversal of 21227769 is 96772212.

It is not a de Polignac number, because 21227769 - 2⁴ = 21227753 is a prime.

It is a super-2 number, since 2×21227769² = 901236353434722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21227779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61899 + ... + 62240.

It is an arithmetic number, because the mean of its divisors is an integer number (2689700).

Almost surely, 2^21227769 is an apocalyptic number.

It is an amenable number.

21227769 is a deficient number, since it is larger than the sum of its proper divisors (11048631).

21227769 is a wasteful number, since it uses less digits than its factorization.

21227769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124164 (or 124161 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 21227769 is about 4607.3603071607. The cubic root of 21227769 is about 276.8862892193.

The spelling of 21227769 in words is "twenty-one million, two hundred twenty-seven thousand, seven hundred sixty-nine".