121111000981 has 2 divisors, whose sum is σ = 121111000982. Its totient is φ = 121111000980.

The previous prime is 121111000963. The next prime is 121111000991. The reversal of 121111000981 is 189000111121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112889952081 + 8221048900 = 335991^2 + 90670^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111000981 - 2¹⁹ = 121110476693 is a prime.

It is a super-2 number, since 2×121111000981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111000931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555500490 + 60555500491.

It is an arithmetic number, because the mean of its divisors is an integer number (60555500491).

Almost surely, 2^121111000981 is an apocalyptic number.

It is an amenable number.

121111000981 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111000981 is an equidigital number, since it uses as much as digits as its factorization.

121111000981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 25.

The spelling of 121111000981 in words is "one hundred twenty-one billion, one hundred eleven million, nine hundred eighty-one", and thus it is an aban number.