122121112021 has 4 divisors (see below), whose sum is σ = 123330232044. Its totient is φ = 120911992000.

The previous prime is 122121111997. The next prime is 122121112037. The reversal of 122121112021 is 120211121221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118946352996 + 3174759025 = 344886^2 + 56345^2 .

It is a cyclic number.

It is not a de Polignac number, because 122121112021 - 2¹⁵ = 122121079253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122121111986 and 122121112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121112121) 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, 604559860 + ... + 604560061.

It is an arithmetic number, because the mean of its divisors is an integer number (30832558011).

Almost surely, 2^122121112021 is an apocalyptic number.

It is an amenable number.

122121112021 is a deficient number, since it is larger than the sum of its proper divisors (1209120023).

122121112021 is a wasteful number, since it uses less digits than its factorization.

122121112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209120022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 122121112021 its reverse (120211121221), we get a palindrome (242332233242).

The spelling of 122121112021 in words is "one hundred twenty-two billion, one hundred twenty-one million, one hundred twelve thousand, twenty-one".