1021011212171 has 2 divisors, whose sum is σ = 1021011212172. Its totient is φ = 1021011212170.

The previous prime is 1021011212167. The next prime is 1021011212209. The reversal of 1021011212171 is 1712121101201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021011212171 - 2² = 1021011212167 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021011212371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510505606085 + 510505606086.

It is an arithmetic number, because the mean of its divisors is an integer number (510505606086).

Almost surely, 2^{1021011212171} is an apocalyptic number.

1021011212171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021011212171 is an equidigital number, since it uses as much as digits as its factorization.

1021011212171 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 20.

Adding to 1021011212171 its reverse (1712121101201), we get a palindrome (2733132313372).

The spelling of 1021011212171 in words is "one trillion, twenty-one billion, eleven million, two hundred twelve thousand, one hundred seventy-one".