21022227 has 32 divisors (see below), whose sum is σ = 33580800. Its totient is φ = 12954816.

The previous prime is 21022223. The next prime is 21022249. The reversal of 21022227 is 72222012.

It is a happy number.

It is not a de Polignac number, because 21022227 - 2² = 21022223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21583 + ... + 22535.

It is an arithmetic number, because the mean of its divisors is an integer number (1049400).

Almost surely, 2^21022227 is an apocalyptic number.

21022227 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21022227 is a deficient number, since it is larger than the sum of its proper divisors (12558573).

21022227 is a wasteful number, since it uses less digits than its factorization.

21022227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 1018 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 21022227 is about 4585.0002181025. Note that the first 3 decimals coincide. The cubic root of 21022227 is about 275.9897207892.

Adding to 21022227 its reverse (72222012), we get a palindrome (93244239).

The spelling of 21022227 in words is "twenty-one million, twenty-two thousand, two hundred twenty-seven".