1201211010121 has 2 divisors, whose sum is σ = 1201211010122. Its totient is φ = 1201211010120.

The previous prime is 1201211010107. The next prime is 1201211010127. The reversal of 1201211010121 is 1210101121021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 934825994496 + 266385015625 = 966864^2 + 516125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201211010121 - 2⁵ = 1201211010089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201211010127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600605505060 + 600605505061.

It is an arithmetic number, because the mean of its divisors is an integer number (600605505061).

Almost surely, 2^{1201211010121} is an apocalyptic number.

It is an amenable number.

1201211010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201211010121 is an equidigital number, since it uses as much as digits as its factorization.

1201211010121 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 13.

Adding to 1201211010121 its reverse (1210101121021), we get a palindrome (2411312131142).

The spelling of 1201211010121 in words is "one trillion, two hundred one billion, two hundred eleven million, ten thousand, one hundred twenty-one".