122742443721 has 4 divisors (see below), whose sum is σ = 163656591632. Its totient is φ = 81828295812.

The previous prime is 122742443671. The next prime is 122742443753. The reversal of 122742443721 is 127344247221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 122742443721 - 2¹⁵ = 122742410953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 122742443721.

It is not an unprimeable number, because it can be changed into a prime (122742443221) 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, 20457073951 + ... + 20457073956.

It is an arithmetic number, because the mean of its divisors is an integer number (40914147908).

Almost surely, 2^122742443721 is an apocalyptic number.

It is an amenable number.

122742443721 is a deficient number, since it is larger than the sum of its proper divisors (40914147911).

122742443721 is an equidigital number, since it uses as much as digits as its factorization.

122742443721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40914147910.

The product of its digits is 150528, while the sum is 39.

The spelling of 122742443721 in words is "one hundred twenty-two billion, seven hundred forty-two million, four hundred forty-three thousand, seven hundred twenty-one".