1220100211181 has 2 divisors, whose sum is σ = 1220100211182. Its totient is φ = 1220100211180.

The previous prime is 1220100211157. The next prime is 1220100211241. The reversal of 1220100211181 is 1811120010221.

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., 766484491081 + 453615720100 = 875491^2 + 673510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220100211181 - 2¹⁸ = 1220099949037 is a prime.

It is a super-2 number, since 2×1220100211181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220100211081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610050105590 + 610050105591.

It is an arithmetic number, because the mean of its divisors is an integer number (610050105591).

Almost surely, 2^{1220100211181} is an apocalyptic number.

It is an amenable number.

1220100211181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220100211181 is an equidigital number, since it uses as much as digits as its factorization.

1220100211181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

The spelling of 1220100211181 in words is "one trillion, two hundred twenty billion, one hundred million, two hundred eleven thousand, one hundred eighty-one".