1021166101 has 2 divisors, whose sum is σ = 1021166102. Its totient is φ = 1021166100.

The previous prime is 1021166099. The next prime is 1021166117. The reversal of 1021166101 is 1016611201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 922640625 + 98525476 = 30375^2 + 9926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021166101 - 2¹ = 1021166099 is a prime.

Together with 1021166099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021166161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510583050 + 510583051.

It is an arithmetic number, because the mean of its divisors is an integer number (510583051).

Almost surely, 2^1021166101 is an apocalyptic number.

It is an amenable number.

1021166101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021166101 is an equidigital number, since it uses as much as digits as its factorization.

1021166101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1021166101 is about 31955.6896498886. The cubic root of 1021166101 is about 1007.0061660022.

Adding to 1021166101 its reverse (1016611201), we get a palindrome (2037777302).

The spelling of 1021166101 in words is "one billion, twenty-one million, one hundred sixty-six thousand, one hundred one".