22215551 has 2 divisors, whose sum is σ = 22215552. Its totient is φ = 22215550.

The previous prime is 22215547. The next prime is 22215569. The reversal of 22215551 is 15551222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22215551 - 2² = 22215547 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22215581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11107775 + 11107776.

It is an arithmetic number, because the mean of its divisors is an integer number (11107776).

Almost surely, 2^22215551 is an apocalyptic number.

22215551 is a deficient number, since it is larger than the sum of its proper divisors (1).

22215551 is an equidigital number, since it uses as much as digits as its factorization.

22215551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 23.

The square root of 22215551 is about 4713.3375648260. The cubic root of 22215551 is about 281.1160853178.

Adding to 22215551 its reverse (15551222), we get a palindrome (37766773).

The spelling of 22215551 in words is "twenty-two million, two hundred fifteen thousand, five hundred fifty-one".