10101220121 has 2 divisors, whose sum is σ = 10101220122. Its totient is φ = 10101220120.

The previous prime is 10101220117. The next prime is 10101220147. The reversal of 10101220121 is 12102210101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9636170896 + 465049225 = 98164^2 + 21565^2 .

It is an emirp because it is prime and its reverse (12102210101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10101220121 - 2² = 10101220117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10101220111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050610060 + 5050610061.

It is an arithmetic number, because the mean of its divisors is an integer number (5050610061).

Almost surely, 2^10101220121 is an apocalyptic number.

It is an amenable number.

10101220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101220121 is an equidigital number, since it uses as much as digits as its factorization.

10101220121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10101220121 its reverse (12102210101), we get a palindrome (22203430222).

The spelling of 10101220121 in words is "ten billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".