122111202121 has 4 divisors (see below), whose sum is σ = 122438578372. Its totient is φ = 121783825872.

The previous prime is 122111202029. The next prime is 122111202137. The reversal of 122111202121 is 121202111221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121202111221 = 353 ⋅343348757.

It can be written as a sum of positive squares in 2 ways, for example, as 52750605625 + 69360596496 = 229675^2 + 263364^2 .

It is a cyclic number.

It is not a de Polignac number, because 122111202121 - 2¹⁵ = 122111169353 is a prime.

It is a super-2 number, since 2×122111202121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122111202095 and 122111202104.

It is not an unprimeable number, because it can be changed into a prime (122111202221) 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, 163687566 + ... + 163688311.

It is an arithmetic number, because the mean of its divisors is an integer number (30609644593).

Almost surely, 2^122111202121 is an apocalyptic number.

It is an amenable number.

122111202121 is a deficient number, since it is larger than the sum of its proper divisors (327376251).

122111202121 is an equidigital number, since it uses as much as digits as its factorization.

122111202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327376250.

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

Adding to 122111202121 its reverse (121202111221), we get a palindrome (243313313342).

The spelling of 122111202121 in words is "one hundred twenty-two billion, one hundred eleven million, two hundred two thousand, one hundred twenty-one".