121906998205 has 4 divisors (see below), whose sum is σ = 146288397852. Its totient is φ = 97525598560.

The previous prime is 121906998151. The next prime is 121906998221. The reversal of 121906998205 is 502899609121.

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 62430519321 + 59476478884 = 249861^2 + 243878^2 .

It is not a de Polignac number, because 121906998205 - 2⁷ = 121906998077 is a prime.

It is a super-2 number, since 2×121906998205² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12190699816 + ... + 12190699825.

It is an arithmetic number, because the mean of its divisors is an integer number (36572099463).

Almost surely, 2^121906998205 is an apocalyptic number.

It is an amenable number.

121906998205 is a deficient number, since it is larger than the sum of its proper divisors (24381399647).

121906998205 is an equidigital number, since it uses as much as digits as its factorization.

121906998205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24381399646.

The product of its (nonzero) digits is 699840, while the sum is 52.

The spelling of 121906998205 in words is "one hundred twenty-one billion, nine hundred six million, nine hundred ninety-eight thousand, two hundred five".