20212161 has 8 divisors (see below), whose sum is σ = 27406560. Its totient is φ = 13246272.

The previous prime is 20212151. The next prime is 20212183. The reversal of 20212161 is 16121202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20212161 - 2⁶ = 20212097 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20212161.

It is not an unprimeable number, because it can be changed into a prime (20212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56920 + ... + 57273.

It is an arithmetic number, because the mean of its divisors is an integer number (3425820).

Almost surely, 2^20212161 is an apocalyptic number.

It is an amenable number.

20212161 is a deficient number, since it is larger than the sum of its proper divisors (7194399).

20212161 is a wasteful number, since it uses less digits than its factorization.

20212161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114255.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20212161 is about 4495.7937007830. The cubic root of 20212161 is about 272.3982101655.

Adding to 20212161 its reverse (16121202), we get a palindrome (36333363).

The spelling of 20212161 in words is "twenty million, two hundred twelve thousand, one hundred sixty-one".