1210101121 has 2 divisors, whose sum is σ = 1210101122. Its totient is φ = 1210101120.

The previous prime is 1210101119. The next prime is 1210101131. The reversal of 1210101121 is 1211010121.

It is an a-pointer prime, because the next prime (1210101131) can be obtained adding 1210101121 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732460096 + 477641025 = 27064^2 + 21855^2 .

It is an emirp because it is prime and its reverse (1211010121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210101121 - 2¹ = 1210101119 is a prime.

Together with 1210101119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1210101098 and 1210101107.

It is not a weakly prime, because it can be changed into another prime (1210101131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605050560 + 605050561.

It is an arithmetic number, because the mean of its divisors is an integer number (605050561).

Almost surely, 2^1210101121 is an apocalyptic number.

It is an amenable number.

1210101121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210101121 is an equidigital number, since it uses as much as digits as its factorization.

1210101121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1210101121 is about 34786.5077436641. The cubic root of 1210101121 is about 1065.6319204477.

Adding to 1210101121 its reverse (1211010121), we get a palindrome (2421111242).

The spelling of 1210101121 in words is "one billion, two hundred ten million, one hundred one thousand, one hundred twenty-one".