20111220201 has 16 divisors (see below), whose sum is σ = 28873540800. Its totient is φ = 12404924928.

The previous prime is 20111220193. The next prime is 20111220211. The reversal of 20111220201 is 10202211102.

It is not a de Polignac number, because 20111220201 - 2³ = 20111220193 is a prime.

It is a super-2 number, since 2×20111220201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20111220211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3338836 + ... + 3344853.

It is an arithmetic number, because the mean of its divisors is an integer number (1804596300).

Almost surely, 2^20111220201 is an apocalyptic number.

It is an amenable number.

20111220201 is a deficient number, since it is larger than the sum of its proper divisors (8762320599).

20111220201 is a wasteful number, since it uses less digits than its factorization.

20111220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6683768.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20111220201 its reverse (10202211102), we get a palindrome (30313431303).

Subtracting from 20111220201 its reverse (10202211102), we obtain a palindrome (9909009099).

The spelling of 20111220201 in words is "twenty billion, one hundred eleven million, two hundred twenty thousand, two hundred one".