20111121201 has 16 divisors (see below), whose sum is σ = 27328238784. Its totient is φ = 13150847424.

The previous prime is 20111121187. The next prime is 20111121209. The reversal of 20111121201 is 10212111102.

It is not a de Polignac number, because 20111121201 - 2¹⁰ = 20111120177 is a prime.

It is a super-2 number, since 2×20111121201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20111121209) 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, 645750 + ... + 676176.

It is an arithmetic number, because the mean of its divisors is an integer number (1708014924).

Almost surely, 2^20111121201 is an apocalyptic number.

It is an amenable number.

20111121201 is a deficient number, since it is larger than the sum of its proper divisors (7217117583).

20111121201 is a wasteful number, since it uses less digits than its factorization.

20111121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34640.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20111121201 its reverse (10212111102), we get a palindrome (30323232303).

The spelling of 20111121201 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, two hundred one".