212142161 has 36 divisors (see below), whose sum is σ = 275942016. Its totient is φ = 159572160.

The previous prime is 212142137. The next prime is 212142211. The reversal of 212142161 is 161241212.

It is a happy number.

It is not a de Polignac number, because 212142161 - 2¹⁸ = 211880017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212142121) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2906021 + ... + 2906093.

It is an arithmetic number, because the mean of its divisors is an integer number (7665056).

Almost surely, 2^212142161 is an apocalyptic number.

It is an amenable number.

212142161 is a deficient number, since it is larger than the sum of its proper divisors (63799855).

212142161 is an equidigital number, since it uses as much as digits as its factorization.

212142161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 138 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 212142161 is about 14565.1007892153. The cubic root of 212142161 is about 596.4064471163.

Adding to 212142161 its reverse (161241212), we get a palindrome (373383373).

The spelling of 212142161 in words is "two hundred twelve million, one hundred forty-two thousand, one hundred sixty-one".