20011111200221 has 16 divisors (see below), whose sum is σ = 21816051720000. Its totient is φ = 18282865176576.

The previous prime is 20011111200203. The next prime is 20011111200229. The reversal of 20011111200221 is 12200211111002.

It is a cyclic number.

It is not a de Polignac number, because 20011111200221 - 2¹⁰ = 20011111199197 is a prime.

It is a super-2 number, since 2×20011111200221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011111200196 and 20011111200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011111200229) 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, 20666276 + ... + 21612893.

It is an arithmetic number, because the mean of its divisors is an integer number (1363503232500).

Almost surely, 2^{20011111200221} is an apocalyptic number.

It is an amenable number.

20011111200221 is a deficient number, since it is larger than the sum of its proper divisors (1804940519779).

20011111200221 is a wasteful number, since it uses less digits than its factorization.

20011111200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42280076.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20011111200221 its reverse (12200211111002), we get a palindrome (32211322311223).

The spelling of 20011111200221 in words is "twenty trillion, eleven billion, one hundred eleven million, two hundred thousand, two hundred twenty-one".