21227887 has 2 divisors, whose sum is σ = 21227888. Its totient is φ = 21227886.

The previous prime is 21227867. The next prime is 21227891. The reversal of 21227887 is 78872212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21227887 - 2²³ = 12839279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21227867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613943 + 10613944.

It is an arithmetic number, because the mean of its divisors is an integer number (10613944).

Almost surely, 2^21227887 is an apocalyptic number.

21227887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227887 is an equidigital number, since it uses as much as digits as its factorization.

21227887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 37.

The square root of 21227887 is about 4607.3731127401. The cubic root of 21227887 is about 276.8868022662.

The spelling of 21227887 in words is "twenty-one million, two hundred twenty-seven thousand, eight hundred eighty-seven".