121103981 has 2 divisors, whose sum is σ = 121103982. Its totient is φ = 121103980.

The previous prime is 121103959. The next prime is 121103987. The reversal of 121103981 is 189301121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90079081 + 31024900 = 9491^2 + 5570^2 .

It is an emirp because it is prime and its reverse (189301121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121103981 is a prime.

It is a super-2 number, since 2×121103981² = 29332348428096722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121103981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121103987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60551990 + 60551991.

It is an arithmetic number, because the mean of its divisors is an integer number (60551991).

Almost surely, 2^121103981 is an apocalyptic number.

It is an amenable number.

121103981 is a deficient number, since it is larger than the sum of its proper divisors (1).

121103981 is an equidigital number, since it uses as much as digits as its factorization.

121103981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 121103981 is about 11004.7253941205. The cubic root of 121103981 is about 494.7503839580.

The spelling of 121103981 in words is "one hundred twenty-one million, one hundred three thousand, nine hundred eighty-one".