122621743721 has 4 divisors (see below), whose sum is σ = 122622959700. Its totient is φ = 122620527744.

The previous prime is 122621743691. The next prime is 122621743729. The reversal of 122621743721 is 127347126221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127347126221 = 7 ⋅18192446603.

It can be written as a sum of positive squares in 2 ways, for example, as 66170359696 + 56451384025 = 257236^2 + 237595^2 .

It is a cyclic number.

It is not a de Polignac number, because 122621743721 - 2²⁶ = 122554634857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122621743729) 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, 441536 + ... + 663473.

It is an arithmetic number, because the mean of its divisors is an integer number (30655739925).

Almost surely, 2^122621743721 is an apocalyptic number.

It is an amenable number.

122621743721 is a deficient number, since it is larger than the sum of its proper divisors (1215979).

122621743721 is a wasteful number, since it uses less digits than its factorization.

122621743721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215978.

The product of its digits is 56448, while the sum is 38.

Adding to 122621743721 its reverse (127347126221), we get a palindrome (249968869942).

The spelling of 122621743721 in words is "one hundred twenty-two billion, six hundred twenty-one million, seven hundred forty-three thousand, seven hundred twenty-one".