10101220200121 has 2 divisors, whose sum is σ = 10101220200122. Its totient is φ = 10101220200120.

The previous prime is 10101220200119. The next prime is 10101220200157. The reversal of 10101220200121 is 12100202210101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10096258406521 + 4961793600 = 3177461^2 + 70440^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101220200121 - 2¹ = 10101220200119 is a prime.

Together with 10101220200119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10101220200221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050610100060 + 5050610100061.

It is an arithmetic number, because the mean of its divisors is an integer number (5050610100061).

Almost surely, 2^{10101220200121} is an apocalyptic number.

It is an amenable number.

10101220200121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101220200121 is an equidigital number, since it uses as much as digits as its factorization.

10101220200121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10101220200121 its reverse (12100202210101), we get a palindrome (22201422410222).

The spelling of 10101220200121 in words is "ten trillion, one hundred one billion, two hundred twenty million, two hundred thousand, one hundred twenty-one".