121523086851 has 4 divisors (see below), whose sum is σ = 162030782472. Its totient is φ = 81015391232.

The previous prime is 121523086849. The next prime is 121523086901. The reversal of 121523086851 is 158680325121.

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

It is a cyclic number.

It is not a de Polignac number, because 121523086851 - 2¹ = 121523086849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121523086351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20253847806 + ... + 20253847811.

It is an arithmetic number, because the mean of its divisors is an integer number (40507695618).

Almost surely, 2^121523086851 is an apocalyptic number.

121523086851 is a deficient number, since it is larger than the sum of its proper divisors (40507695621).

121523086851 is an equidigital number, since it uses as much as digits as its factorization.

121523086851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40507695620.

The product of its (nonzero) digits is 115200, while the sum is 42.

The spelling of 121523086851 in words is "one hundred twenty-one billion, five hundred twenty-three million, eighty-six thousand, eight hundred fifty-one".