121031211989 has 2 divisors, whose sum is σ = 121031211990. Its totient is φ = 121031211988.

The previous prime is 121031211971. The next prime is 121031212031. The reversal of 121031211989 is 989112130121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120119775889 + 911436100 = 346583^2 + 30190^2 .

It is a cyclic number.

It is not a de Polignac number, because 121031211989 - 2⁸ = 121031211733 is a prime.

It is a super-2 number, since 2×121031211989² (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 (121031211929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60515605994 + 60515605995.

It is an arithmetic number, because the mean of its divisors is an integer number (60515605995).

Almost surely, 2^121031211989 is an apocalyptic number.

It is an amenable number.

121031211989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121031211989 is an equidigital number, since it uses as much as digits as its factorization.

121031211989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 38.

The spelling of 121031211989 in words is "one hundred twenty-one billion, thirty-one million, two hundred eleven thousand, nine hundred eighty-nine".