20111121221012 has 12 divisors (see below), whose sum is σ = 36052863652596. Its totient is φ = 9810303034560.

The previous prime is 20111121220933. The next prime is 20111121221017. The reversal of 20111121221012 is 21012212111102.

It can be written as a sum of positive squares in 2 ways, for example, as 1448686660996 + 18662434560016 = 1203614^2 + 4320004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121221017) 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, 61314393803 + ... + 61314394130.

It is an arithmetic number, because the mean of its divisors is an integer number (3004405304383).

Almost surely, 2^{20111121221012} is an apocalyptic number.

It is an amenable number.

20111121221012 is a deficient number, since it is larger than the sum of its proper divisors (15941742431584).

20111121221012 is a wasteful number, since it uses less digits than its factorization.

20111121221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122628787978 (or 122628787976 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20111121221012 its reverse (21012212111102), we get a palindrome (41123333332114).

The spelling of 20111121221012 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".