121417209871 has 4 divisors (see below), whose sum is σ = 121649365672. Its totient is φ = 121185054072.

The previous prime is 121417209869. The next prime is 121417209899. The reversal of 121417209871 is 178902714121.

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 121417209871 - 2¹ = 121417209869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121417209671) 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, 116077116 + ... + 116078161.

It is an arithmetic number, because the mean of its divisors is an integer number (30412341418).

Almost surely, 2^121417209871 is an apocalyptic number.

121417209871 is a deficient number, since it is larger than the sum of its proper divisors (232155801).

121417209871 is an equidigital number, since it uses as much as digits as its factorization.

121417209871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232155800.

The product of its (nonzero) digits is 56448, while the sum is 43.

The spelling of 121417209871 in words is "one hundred twenty-one billion, four hundred seventeen million, two hundred nine thousand, eight hundred seventy-one".