20111202211021 has 4 divisors (see below), whose sum is σ = 20111212890844. Its totient is φ = 20111191531200.

The previous prime is 20111202211019. The next prime is 20111202211069. The reversal of 20111202211021 is 12011220211102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8118909396900 + 11992292814121 = 2849370^2 + 3462989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111202211021 - 2¹ = 20111202211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111202210986 and 20111202211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111202215021) 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, 1678350 + ... + 6560431.

It is an arithmetic number, because the mean of its divisors is an integer number (5027803222711).

Almost surely, 2^{20111202211021} is an apocalyptic number.

It is an amenable number.

20111202211021 is a deficient number, since it is larger than the sum of its proper divisors (10679823).

20111202211021 is an equidigital number, since it uses as much as digits as its factorization.

20111202211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10679822.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20111202211021 its reverse (12011220211102), we get a palindrome (32122422422123).

The spelling of 20111202211021 in words is "twenty trillion, one hundred eleven billion, two hundred two million, two hundred eleven thousand, twenty-one".