121010121989 has 2 divisors, whose sum is σ = 121010121990. Its totient is φ = 121010121988.

The previous prime is 121010121961. The next prime is 121010122027. The reversal of 121010121989 is 989121010121.

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., 80637257089 + 40372864900 = 283967^2 + 200930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121010121989 is a prime.

It is a super-2 number, since 2×121010121989² (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 (121010121929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505060994 + 60505060995.

It is an arithmetic number, because the mean of its divisors is an integer number (60505060995).

Almost surely, 2^121010121989 is an apocalyptic number.

It is an amenable number.

121010121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121010121989 is an equidigital number, since it uses as much as digits as its factorization.

121010121989 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 121010121989 in words is "one hundred twenty-one billion, ten million, one hundred twenty-one thousand, nine hundred eighty-nine".