20012166201 has 4 divisors (see below), whose sum is σ = 26682888272. Its totient is φ = 13341444132.

The previous prime is 20012166191. The next prime is 20012166203. The reversal of 20012166201 is 10266121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-20012166201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012166203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335361031 + ... + 3335361036.

It is an arithmetic number, because the mean of its divisors is an integer number (6670722068).

Almost surely, 2^20012166201 is an apocalyptic number.

It is an amenable number.

20012166201 is a deficient number, since it is larger than the sum of its proper divisors (6670722071).

20012166201 is an equidigital number, since it uses as much as digits as its factorization.

20012166201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670722070.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 20012166201 its reverse (10266121002), we get a palindrome (30278287203).

The spelling of 20012166201 in words is "twenty billion, twelve million, one hundred sixty-six thousand, two hundred one".