121353531989 has 2 divisors, whose sum is σ = 121353531990. Its totient is φ = 121353531988.

The previous prime is 121353531973. The next prime is 121353532033. The reversal of 121353531989 is 989135353121.

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., 108344988964 + 13008543025 = 329158^2 + 114055^2 .

It is a cyclic number.

It is not a de Polignac number, because 121353531989 - 2⁴ = 121353531973 is a prime.

It is a super-2 number, since 2×121353531989² (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 (121353431989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60676765994 + 60676765995.

It is an arithmetic number, because the mean of its divisors is an integer number (60676765995).

Almost surely, 2^121353531989 is an apocalyptic number.

It is an amenable number.

121353531989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121353531989 is an equidigital number, since it uses as much as digits as its factorization.

121353531989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 50.

The spelling of 121353531989 in words is "one hundred twenty-one billion, three hundred fifty-three million, five hundred thirty-one thousand, nine hundred eighty-nine".