122741555621 has 4 divisors (see below), whose sum is σ = 122957270700. Its totient is φ = 122525840544.

The previous prime is 122741555603. The next prime is 122741555623. The reversal of 122741555621 is 126555147221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126555147221 = 157013 ⋅806017.

It can be written as a sum of positive squares in 2 ways, for example, as 70204331521 + 52537224100 = 264961^2 + 229210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122741555621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122741555623) 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, 107856686 + ... + 107857823.

It is an arithmetic number, because the mean of its divisors is an integer number (30739317675).

Almost surely, 2^122741555621 is an apocalyptic number.

It is an amenable number.

122741555621 is a deficient number, since it is larger than the sum of its proper divisors (215715079).

122741555621 is an equidigital number, since it uses as much as digits as its factorization.

122741555621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215715078.

The product of its digits is 168000, while the sum is 41.

The spelling of 122741555621 in words is "one hundred twenty-two billion, seven hundred forty-one million, five hundred fifty-five thousand, six hundred twenty-one".