121551303145 has 4 divisors (see below), whose sum is σ = 145861563780. Its totient is φ = 97241042512.

The previous prime is 121551303143. The next prime is 121551303157. The reversal of 121551303145 is 541303155121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64607980761 + 56943322384 = 254181^2 + 238628^2 .

It is a cyclic number.

It is not a de Polignac number, because 121551303145 - 2¹ = 121551303143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121551303143) 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, 12155130310 + ... + 12155130319.

It is an arithmetic number, because the mean of its divisors is an integer number (36465390945).

Almost surely, 2^121551303145 is an apocalyptic number.

It is an amenable number.

121551303145 is a deficient number, since it is larger than the sum of its proper divisors (24310260635).

121551303145 is an equidigital number, since it uses as much as digits as its factorization.

121551303145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24310260634.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 121551303145 its reverse (541303155121), we get a palindrome (662854458266).

The spelling of 121551303145 in words is "one hundred twenty-one billion, five hundred fifty-one million, three hundred three thousand, one hundred forty-five".