22055521 has 2 divisors, whose sum is σ = 22055522.
Its totient is φ = 22055520.
The previous prime is 22055503. The next prime is 22055531. The reversal of 22055521 is 12555022.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 20151121 + 1904400 = 4489^2 + 1380^2
It is a cyclic number.
It is not a de Polignac number, because 22055521 - 25 = 22055489 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 22055492 and 22055501.
It is not a weakly prime, because it can be changed into another prime (22055531) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11027760 + 11027761.
It is an arithmetic number, because the mean of its divisors is an integer number (11027761).
Almost surely, 222055521 is an apocalyptic number.
It is an amenable number.
22055521 is a deficient number, since it is larger than the sum of its proper divisors (1).
22055521 is an equidigital number, since it uses as much as digits as its factorization.
22055521 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1000, while the sum is 22.
The square root of 22055521 is about 4696.3305888747.
The cubic root of 22055521 is about 280.4394502435.
The spelling of 22055521 in words is "twenty-two million, fifty-five thousand, five hundred twenty-one".