22235552221 has 2 divisors, whose sum is σ = 22235552222. Its totient is φ = 22235552220.

The previous prime is 22235552219. The next prime is 22235552233. The reversal of 22235552221 is 12225553222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19266828025 + 2968724196 = 138805^2 + 54486^2 .

It is a cyclic number.

It is not a de Polignac number, because 22235552221 - 2¹ = 22235552219 is a prime.

Together with 22235552219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22235552201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11117776110 + 11117776111.

It is an arithmetic number, because the mean of its divisors is an integer number (11117776111).

Almost surely, 2^22235552221 is an apocalyptic number.

It is an amenable number.

22235552221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22235552221 is an equidigital number, since it uses as much as digits as its factorization.

22235552221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 31.

It can be divided in two parts, 222355 and 52221, that added together give a square (274576 = 524²).

The spelling of 22235552221 in words is "twenty-two billion, two hundred thirty-five million, five hundred fifty-two thousand, two hundred twenty-one".