120121109981 has 2 divisors, whose sum is σ = 120121109982. Its totient is φ = 120121109980.

The previous prime is 120121109971. The next prime is 120121110071. The reversal of 120121109981 is 189901121021.

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., 100003942756 + 20117167225 = 316234^2 + 141835^2 .

It is a cyclic number.

It is not a de Polignac number, because 120121109981 - 2¹⁰ = 120121108957 is a prime.

It is a super-2 number, since 2×120121109981² (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 (120121109971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060554990 + 60060554991.

It is an arithmetic number, because the mean of its divisors is an integer number (60060554991).

Almost surely, 2^120121109981 is an apocalyptic number.

It is an amenable number.

120121109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

120121109981 is an equidigital number, since it uses as much as digits as its factorization.

120121109981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 120121109981 in words is "one hundred twenty billion, one hundred twenty-one million, one hundred nine thousand, nine hundred eighty-one".