22209209251 has 2 divisors, whose sum is σ = 22209209252. Its totient is φ = 22209209250.

The previous prime is 22209209237. The next prime is 22209209293. The reversal of 22209209251 is 15290290222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22209209251 - 2¹⁷ = 22209078179 is a prime.

It is not a weakly prime, because it can be changed into another prime (22209209651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11104604625 + 11104604626.

It is an arithmetic number, because the mean of its divisors is an integer number (11104604626).

Almost surely, 2^22209209251 is an apocalyptic number.

22209209251 is a deficient number, since it is larger than the sum of its proper divisors (1).

22209209251 is an equidigital number, since it uses as much as digits as its factorization.

22209209251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 22209209251 its reverse (15290290222), we get a palindrome (37499499473).

The spelling of 22209209251 in words is "twenty-two billion, two hundred nine million, two hundred nine thousand, two hundred fifty-one".