122121121020121 has 4 divisors (see below), whose sum is σ = 122123200337892. Its totient is φ = 122119041702352.

The previous prime is 122121121020103. The next prime is 122121121020149. The reversal of 122121121020121 is 121020121121221.

It is a happy number.

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 115619697075600 + 6501423944521 = 10752660^2 + 2549789^2 .

It is a cyclic number.

It is not a de Polignac number, because 122121121020121 - 2⁹ = 122121121019609 is a prime.

It is a super-2 number, since 2×122121121020121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122121121021121) 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, 1039570786 + ... + 1039688251.

It is an arithmetic number, because the mean of its divisors is an integer number (30530800084473).

Almost surely, 2^{122121121020121} is an apocalyptic number.

It is an amenable number.

122121121020121 is a deficient number, since it is larger than the sum of its proper divisors (2079317771).

122121121020121 is an equidigital number, since it uses as much as digits as its factorization.

122121121020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079317770.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 122121121020121 its reverse (121020121121221), we get a palindrome (243141242141342).

The spelling of 122121121020121 in words is "one hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty thousand, one hundred twenty-one".