11221200220981 has 2 divisors, whose sum is σ = 11221200220982. Its totient is φ = 11221200220980.

The previous prime is 11221200220949. The next prime is 11221200221003. The reversal of 11221200220981 is 18902200212211.

11221200220981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11030641780081 + 190558440900 = 3321241^2 + 436530^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221200220981 - 2⁵ = 11221200220949 is a prime.

It is a super-2 number, since 2×11221200220981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221200220921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610600110490 + 5610600110491.

It is an arithmetic number, because the mean of its divisors is an integer number (5610600110491).

Almost surely, 2^{11221200220981} is an apocalyptic number.

It is an amenable number.

11221200220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221200220981 is an equidigital number, since it uses as much as digits as its factorization.

11221200220981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 11221200220981 in words is "eleven trillion, two hundred twenty-one billion, two hundred million, two hundred twenty thousand, nine hundred eighty-one".