1211010013161 has 24 divisors (see below), whose sum is σ = 1883851449480. Its totient is φ = 745213948416.

The previous prime is 1211010013121. The next prime is 1211010013181. The reversal of 1211010013161 is 1613100101121.

It can be written as a sum of positive squares in 4 ways, for example, as 318823976025 + 892186037136 = 564645^2 + 944556^2 .

It is not a de Polignac number, because 1211010013161 - 2³⁰ = 1209936271337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211010013121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4144305 + ... + 4426881.

It is an arithmetic number, because the mean of its divisors is an integer number (78493810395).

Almost surely, 2^{1211010013161} is an apocalyptic number.

It is an amenable number.

1211010013161 is a deficient number, since it is larger than the sum of its proper divisors (672841436319).

1211010013161 is a wasteful number, since it uses less digits than its factorization.

1211010013161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319225 (or 319222 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 1211010013161 its reverse (1613100101121), we get a palindrome (2824110114282).

The spelling of 1211010013161 in words is "one trillion, two hundred eleven billion, ten million, thirteen thousand, one hundred sixty-one".