2211211100981 has 2 divisors, whose sum is σ = 2211211100982. Its totient is φ = 2211211100980.

The previous prime is 2211211100941. The next prime is 2211211101017. The reversal of 2211211100981 is 1890011121122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2191483493956 + 19727607025 = 1480366^2 + 140455^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211211100981 - 2²⁶ = 2211143992117 is a prime.

It is a super-2 number, since 2×2211211100981² (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 (2211211100921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105605550490 + 1105605550491.

It is an arithmetic number, because the mean of its divisors is an integer number (1105605550491).

Almost surely, 2^{2211211100981} is an apocalyptic number.

It is an amenable number.

2211211100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211211100981 is an equidigital number, since it uses as much as digits as its factorization.

2211211100981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 2211211100981 in words is "two trillion, two hundred eleven billion, two hundred eleven million, one hundred thousand, nine hundred eighty-one".