122123321021 has 4 divisors (see below), whose sum is σ = 131517422652. Its totient is φ = 112729219392.

The previous prime is 122123321011. The next prime is 122123321027. The reversal of 122123321021 is 120123321221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120123321221 = 127 ⋅945852923.

It can be written as a sum of positive squares in 2 ways, for example, as 63176822500 + 58946498521 = 251350^2 + 242789^2 .

It is a cyclic number.

It is not a de Polignac number, because 122123321021 - 2¹⁴ = 122123304637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122123320984 and 122123321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122123321027) 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, 4697050796 + ... + 4697050821.

It is an arithmetic number, because the mean of its divisors is an integer number (32879355663).

Almost surely, 2^122123321021 is an apocalyptic number.

It is an amenable number.

122123321021 is a deficient number, since it is larger than the sum of its proper divisors (9394101631).

122123321021 is an equidigital number, since it uses as much as digits as its factorization.

122123321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9394101630.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 122123321021 its reverse (120123321221), we get a palindrome (242246642242).

The spelling of 122123321021 in words is "one hundred twenty-two billion, one hundred twenty-three million, three hundred twenty-one thousand, twenty-one".