22213251 has 8 divisors (see below), whose sum is σ = 32908560. Its totient is φ = 14808816.

The previous prime is 22213183. The next prime is 22213259. The reversal of 22213251 is 15231222.

It is not a de Polignac number, because 22213251 - 2⁹ = 22212739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22213259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411330 + ... + 411383.

It is an arithmetic number, because the mean of its divisors is an integer number (4113570).

Almost surely, 2^22213251 is an apocalyptic number.

22213251 is a deficient number, since it is larger than the sum of its proper divisors (10695309).

22213251 is an equidigital number, since it uses as much as digits as its factorization.

22213251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822722 (or 822716 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 22213251 is about 4713.0935700451. The cubic root of 22213251 is about 281.1063835656.

Adding to 22213251 its reverse (15231222), we get a palindrome (37444473).

The spelling of 22213251 in words is "twenty-two million, two hundred thirteen thousand, two hundred fifty-one".