22201100022221 has 2 divisors, whose sum is σ = 22201100022222. Its totient is φ = 22201100022220.

The previous prime is 22201100022209. The next prime is 22201100022263. The reversal of 22201100022221 is 12222000110222.

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., 15998440038025 + 6202659984196 = 3999805^2 + 2490514^2 .

It is a cyclic number.

It is not a de Polignac number, because 22201100022221 - 2¹⁴ = 22201100005837 is a prime.

It is a super-2 number, since 2×22201100022221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22201100022221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22201100022271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11100550011110 + 11100550011111.

It is an arithmetic number, because the mean of its divisors is an integer number (11100550011111).

Almost surely, 2^{22201100022221} is an apocalyptic number.

It is an amenable number.

22201100022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22201100022221 is an equidigital number, since it uses as much as digits as its factorization.

22201100022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22201100022221 its reverse (12222000110222), we get a palindrome (34423100132443).

The spelling of 22201100022221 in words is "twenty-two trillion, two hundred one billion, one hundred million, twenty-two thousand, two hundred twenty-one".