121705643201 has 4 divisors (see below), whose sum is σ = 122012206932. Its totient is φ = 121399079472.

The previous prime is 121705643197. The next prime is 121705643203. The reversal of 121705643201 is 102346507121.

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 51403772176 + 70301871025 = 226724^2 + 265145^2 .

It is a cyclic number.

It is not a de Polignac number, because 121705643201 - 2² = 121705643197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121705643203) 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, 153281270 + ... + 153282063.

It is an arithmetic number, because the mean of its divisors is an integer number (30503051733).

Almost surely, 2^121705643201 is an apocalyptic number.

It is an amenable number.

121705643201 is a deficient number, since it is larger than the sum of its proper divisors (306563731).

121705643201 is an equidigital number, since it uses as much as digits as its factorization.

121705643201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306563730.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 121705643201 in words is "one hundred twenty-one billion, seven hundred five million, six hundred forty-three thousand, two hundred one".