121561024989 has 8 divisors (see below), whose sum is σ = 165529906560. Its totient is φ = 79316413376.

The previous prime is 121561024973. The next prime is 121561025021. The reversal of 121561024989 is 989420165121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121561024989 - 2⁴ = 121561024973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121561024489) 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 in 7 ways as a sum of consecutive naturals, for example, 431067324 + ... + 431067605.

It is an arithmetic number, because the mean of its divisors is an integer number (20691238320).

Almost surely, 2^121561024989 is an apocalyptic number.

It is an amenable number.

121561024989 is a deficient number, since it is larger than the sum of its proper divisors (43968881571).

121561024989 is an equidigital number, since it uses as much as digits as its factorization.

121561024989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862134979.

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 121561024989 in words is "one hundred twenty-one billion, five hundred sixty-one million, twenty-four thousand, nine hundred eighty-nine".