21250227 has 16 divisors (see below), whose sum is σ = 30239360. Its totient is φ = 13234752.

The previous prime is 21250217. The next prime is 21250253. The reversal of 21250227 is 72205212.

It is a happy number.

It is not a de Polignac number, because 21250227 - 2⁴ = 21250211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1608 + ... + 6714.

It is an arithmetic number, because the mean of its divisors is an integer number (1889960).

Almost surely, 2^21250227 is an apocalyptic number.

21250227 is a deficient number, since it is larger than the sum of its proper divisors (8989133).

21250227 is a wasteful number, since it uses less digits than its factorization.

21250227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5202.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 21250227 is about 4609.7968501877. The cubic root of 21250227 is about 276.9838991106.

Adding to 21250227 its reverse (72205212), we get a palindrome (93455439).

The spelling of 21250227 in words is "twenty-one million, two hundred fifty thousand, two hundred twenty-seven".