121989576569 has 16 divisors (see below), whose sum is σ = 141033209856. Its totient is φ = 103356162000.

The previous prime is 121989576557. The next prime is 121989576581. The reversal of 121989576569 is 965675989121.

It is an interprime number because it is at equal distance from previous prime (121989576557) and next prime (121989576581).

It is a de Polignac number, because none of the positive numbers 2^k-121989576569 is a prime.

It is a super-2 number, since 2×121989576569² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121989576499 and 121989576508.

It is not an unprimeable number, because it can be changed into a prime (121989576529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12257 + ... + 494094.

It is an arithmetic number, because the mean of its divisors is an integer number (8814575616).

Almost surely, 2^121989576569 is an apocalyptic number.

It is an amenable number.

121989576569 is a deficient number, since it is larger than the sum of its proper divisors (19043633287).

121989576569 is a wasteful number, since it uses less digits than its factorization.

121989576569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506756.

The product of its digits is 73483200, while the sum is 68.

The spelling of 121989576569 in words is "one hundred twenty-one billion, nine hundred eighty-nine million, five hundred seventy-six thousand, five hundred sixty-nine".