20111021111201 has 4 divisors (see below), whose sum is σ = 20112725302404. Its totient is φ = 20109316920000.

The previous prime is 20111021111179. The next prime is 20111021111287. The reversal of 20111021111201 is 10211112011102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16074678936976 + 4036342174225 = 4009324^2 + 2009065^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111021111201 - 2¹⁴ = 20111021094817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111021111801) 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, 852077900 + ... + 852101501.

It is an arithmetic number, because the mean of its divisors is an integer number (5028181325601).

Almost surely, 2^{20111021111201} is an apocalyptic number.

It is an amenable number.

20111021111201 is a deficient number, since it is larger than the sum of its proper divisors (1704191203).

20111021111201 is a wasteful number, since it uses less digits than its factorization.

20111021111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704191202.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20111021111201 its reverse (10211112011102), we get a palindrome (30322133122303).

The spelling of 20111021111201 in words is "twenty trillion, one hundred eleven billion, twenty-one million, one hundred eleven thousand, two hundred one".