122121010101221 has 4 divisors (see below), whose sum is σ = 125099571323244. Its totient is φ = 119142448879200.

The previous prime is 122121010101199. The next prime is 122121010101239. The reversal of 122121010101221 is 122101010121221.

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 1569723328996 + 120551286772225 = 1252886^2 + 10979585^2 .

It is a cyclic number.

It is not a de Polignac number, because 122121010101221 - 2³⁸ = 121846132194277 is a prime.

It is a super-2 number, since 2×122121010101221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 122121010101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121010104221) 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, 1489280610950 + ... + 1489280611031.

It is an arithmetic number, because the mean of its divisors is an integer number (31274892830811).

Almost surely, 2^{122121010101221} is an apocalyptic number.

It is an amenable number.

122121010101221 is a deficient number, since it is larger than the sum of its proper divisors (2978561222023).

122121010101221 is an equidigital number, since it uses as much as digits as its factorization.

122121010101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978561222022.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 122121010101221 its reverse (122101010121221), we get a palindrome (244222020222442).

The spelling of 122121010101221 in words is "one hundred twenty-two trillion, one hundred twenty-one billion, ten million, one hundred one thousand, two hundred twenty-one".