222101221211981 has 2 divisors, whose sum is σ = 222101221211982. Its totient is φ = 222101221211980.

The previous prime is 222101221211941. The next prime is 222101221212037. The reversal of 222101221211981 is 189112122101222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176793056286025 + 45308164925956 = 13296355^2 + 6731134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222101221211981 is a prime.

It is a super-2 number, since 2×222101221211981² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222101221211941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111050610605990 + 111050610605991.

It is an arithmetic number, because the mean of its divisors is an integer number (111050610605991).

Almost surely, 2^{222101221211981} is an apocalyptic number.

It is an amenable number.

222101221211981 is a deficient number, since it is larger than the sum of its proper divisors (1).

222101221211981 is an equidigital number, since it uses as much as digits as its factorization.

222101221211981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 35.

The spelling of 222101221211981 in words is "two hundred twenty-two trillion, one hundred one billion, two hundred twenty-one million, two hundred eleven thousand, nine hundred eighty-one".