211420161 has 6 divisors (see below), whose sum is σ = 305384690. Its totient is φ = 140946768.

The previous prime is 211420151. The next prime is 211420171. The reversal of 211420161 is 161024112.

It is an interprime number because it is at equal distance from previous prime (211420151) and next prime (211420171).

It can be written as a sum of positive squares in only one way, i.e., 164634561 + 46785600 = 12831^2 + 6840^2 .

It is not a de Polignac number, because 211420161 - 2²³ = 203031553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211420151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11745556 + ... + 11745573.

Almost surely, 2^211420161 is an apocalyptic number.

It is an amenable number.

211420161 is a deficient number, since it is larger than the sum of its proper divisors (93964529).

211420161 is a wasteful number, since it uses less digits than its factorization.

211420161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23491135 (or 23491132 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 211420161 is about 14540.2943917928. The cubic root of 211420161 is about 595.7290791932.

Adding to 211420161 its reverse (161024112), we get a palindrome (372444273).

The spelling of 211420161 in words is "two hundred eleven million, four hundred twenty thousand, one hundred sixty-one".