121208651427 has 4 divisors (see below), whose sum is σ = 161611535240. Its totient is φ = 80805767616.

The previous prime is 121208651423. The next prime is 121208651449. The reversal of 121208651427 is 724156802121.

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

It is not a de Polignac number, because 121208651427 - 2² = 121208651423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121208651423) by changing a digit.

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, 20201441902 + ... + 20201441907.

It is an arithmetic number, because the mean of its divisors is an integer number (40402883810).

Almost surely, 2^121208651427 is an apocalyptic number.

121208651427 is a deficient number, since it is larger than the sum of its proper divisors (40402883813).

121208651427 is an equidigital number, since it uses as much as digits as its factorization.

121208651427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40402883812.

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 121208651427 in words is "one hundred twenty-one billion, two hundred eight million, six hundred fifty-one thousand, four hundred twenty-seven".