20011220201 has 12 divisors (see below), whose sum is σ = 23461659648. Its totient is φ = 17017410312.

The previous prime is 20011220197. The next prime is 20011220213. The reversal of 20011220201 is 10202211002.

It is a happy number.

It is not a de Polignac number, because 20011220201 - 2² = 20011220197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20011220231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1601621 + ... + 1614066.

It is an arithmetic number, because the mean of its divisors is an integer number (1955138304).

Almost surely, 2^20011220201 is an apocalyptic number.

It is an amenable number.

20011220201 is a deficient number, since it is larger than the sum of its proper divisors (3450439447).

20011220201 is a wasteful number, since it uses less digits than its factorization.

20011220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215828 (or 3215821 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20011220201 its reverse (10202211002), we get a palindrome (30213431203).

The spelling of 20011220201 in words is "twenty billion, eleven million, two hundred twenty thousand, two hundred one".