2101231232161 has 2 divisors, whose sum is σ = 2101231232162. Its totient is φ = 2101231232160.

The previous prime is 2101231232153. The next prime is 2101231232183. The reversal of 2101231232161 is 1612321321012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1363187013136 + 738044219025 = 1167556^2 + 859095^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101231232161 - 2³ = 2101231232153 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101231632161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050615616080 + 1050615616081.

It is an arithmetic number, because the mean of its divisors is an integer number (1050615616081).

Almost surely, 2^{2101231232161} is an apocalyptic number.

It is an amenable number.

2101231232161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101231232161 is an equidigital number, since it uses as much as digits as its factorization.

2101231232161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 2101231232161 its reverse (1612321321012), we get a palindrome (3713552553173).

The spelling of 2101231232161 in words is "two trillion, one hundred one billion, two hundred thirty-one million, two hundred thirty-two thousand, one hundred sixty-one".