121939941601 has 3 divisors (see below), whose sum is σ = 121940290801. Its totient is φ = 121939592402.

The previous prime is 121939941587. The next prime is 121939941623. The reversal of 121939941601 is 106149939121.

The square root of 121939941601 is 349199.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 121939941601 - 2¹⁵ = 121939908833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121939941401) 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 2 ways as a sum of consecutive naturals, for example, 174600 + ... + 523798.

Almost surely, 2^121939941601 is an apocalyptic number.

121939941601 is the 349199-th square number.

121939941601 is the 174600-th centered octagonal number.

It is an amenable number.

121939941601 is a deficient number, since it is larger than the sum of its proper divisors (349200).

121939941601 is an frugal number, since it uses more digits than its factorization.

121939941601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698398 (or 349199 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 46.

The spelling of 121939941601 in words is "one hundred twenty-one billion, nine hundred thirty-nine million, nine hundred forty-one thousand, six hundred one".