11222221221961 has 2 divisors, whose sum is σ = 11222221221962. Its totient is φ = 11222221221960.

The previous prime is 11222221221943. The next prime is 11222221222061. The reversal of 11222221221961 is 16912212222211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10556293412025 + 665927809936 = 3249045^2 + 816044^2 .

It is an emirp because it is prime and its reverse (16912212222211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11222221221961 - 2¹⁹ = 11222220697673 is a prime.

It is not a weakly prime, because it can be changed into another prime (11222221221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611110610980 + 5611110610981.

It is an arithmetic number, because the mean of its divisors is an integer number (5611110610981).

Almost surely, 2^{11222221221961} is an apocalyptic number.

It is an amenable number.

11222221221961 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222221221961 is an equidigital number, since it uses as much as digits as its factorization.

11222221221961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The spelling of 11222221221961 in words is "eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, nine hundred sixty-one".