121572746189 has 8 divisors (see below), whose sum is σ = 125376590328. Its totient is φ = 117796170240.

The previous prime is 121572746177. The next prime is 121572746203. The reversal of 121572746189 is 981647275121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36372974089 + 85199772100 = 190717^2 + 291890^2 .

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 121572746189 - 2⁸ = 121572745933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121572746189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121572746149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6807992 + ... + 6825825.

It is an arithmetic number, because the mean of its divisors is an integer number (15672073791).

Almost surely, 2^121572746189 is an apocalyptic number.

It is an amenable number.

121572746189 is a deficient number, since it is larger than the sum of its proper divisors (3803844139).

121572746189 is a wasteful number, since it uses less digits than its factorization.

121572746189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13634095.

The product of its digits is 1693440, while the sum is 53.

The spelling of 121572746189 in words is "one hundred twenty-one billion, five hundred seventy-two million, seven hundred forty-six thousand, one hundred eighty-nine".