22211251 has 2 divisors, whose sum is σ = 22211252. Its totient is φ = 22211250.

The previous prime is 22211249. The next prime is 22211279. The reversal of 22211251 is 15211222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22211251 - 2¹ = 22211249 is a prime.

It is a super-3 number, since 3×22211251³ (a number of 23 digits) contains 333 as substring.

Together with 22211249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22211201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11105625 + 11105626.

It is an arithmetic number, because the mean of its divisors is an integer number (11105626).

Almost surely, 2^22211251 is an apocalyptic number.

22211251 is a deficient number, since it is larger than the sum of its proper divisors (1).

22211251 is an equidigital number, since it uses as much as digits as its factorization.

22211251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 16.

The square root of 22211251 is about 4712.8813904023. The cubic root of 22211251 is about 281.0979467150.

Adding to 22211251 its reverse (15211222), we get a palindrome (37422473).

The spelling of 22211251 in words is "twenty-two million, two hundred eleven thousand, two hundred fifty-one".