121765425247 has 4 divisors (see below), whose sum is σ = 121768457800. Its totient is φ = 121762392696.

The previous prime is 121765425211. The next prime is 121765425251. The reversal of 121765425247 is 742524567121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121765425247 is a prime.

It is a super-2 number, since 2×121765425247² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121765425197 and 121765425206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121765425347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1455228 + ... + 1536625.

It is an arithmetic number, because the mean of its divisors is an integer number (30442114450).

Almost surely, 2^121765425247 is an apocalyptic number.

121765425247 is a deficient number, since it is larger than the sum of its proper divisors (3032553).

121765425247 is an equidigital number, since it uses as much as digits as its factorization.

121765425247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032552.

The product of its digits is 940800, while the sum is 46.

The spelling of 121765425247 in words is "one hundred twenty-one billion, seven hundred sixty-five million, four hundred twenty-five thousand, two hundred forty-seven".