1211120170021 has 2 divisors, whose sum is σ = 1211120170022. Its totient is φ = 1211120170020.

The previous prime is 1211120169989. The next prime is 1211120170033. The reversal of 1211120170021 is 1200710211121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1070128180900 + 140991989121 = 1034470^2 + 375489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211120170021 - 2⁵ = 1211120169989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211120170081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605560085010 + 605560085011.

It is an arithmetic number, because the mean of its divisors is an integer number (605560085011).

Almost surely, 2^{1211120170021} is an apocalyptic number.

It is an amenable number.

1211120170021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211120170021 is an equidigital number, since it uses as much as digits as its factorization.

1211120170021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 1211120170021 its reverse (1200710211121), we get a palindrome (2411830381142).

The spelling of 1211120170021 in words is "one trillion, two hundred eleven billion, one hundred twenty million, one hundred seventy thousand, twenty-one".