121249678195 has 4 divisors (see below), whose sum is σ = 145499613840. Its totient is φ = 96999742552.

The previous prime is 121249678157. The next prime is 121249678211. The reversal of 121249678195 is 591876942121.

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 121249678195 - 2²⁹ = 120712807283 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12124967815 + ... + 12124967824.

It is an arithmetic number, because the mean of its divisors is an integer number (36374903460).

Almost surely, 2^121249678195 is an apocalyptic number.

121249678195 is a deficient number, since it is larger than the sum of its proper divisors (24249935645).

121249678195 is an equidigital number, since it uses as much as digits as its factorization.

121249678195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24249935644.

The product of its digits is 2177280, while the sum is 55.

The spelling of 121249678195 in words is "one hundred twenty-one billion, two hundred forty-nine million, six hundred seventy-eight thousand, one hundred ninety-five".