20200111221 has 16 divisors (see below), whose sum is σ = 27986444288. Its totient is φ = 12946014000.

The previous prime is 20200111181. The next prime is 20200111223. The reversal of 20200111221 is 12211100202.

It is not a de Polignac number, because 20200111221 - 2¹⁰ = 20200110197 is a prime.

It is a super-2 number, since 2×20200111221² (a number of 21 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 = 20200111197 and 20200111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200111223) 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, 705181 + ... + 733266.

It is an arithmetic number, because the mean of its divisors is an integer number (1749152768).

Almost surely, 2^20200111221 is an apocalyptic number.

It is an amenable number.

20200111221 is a deficient number, since it is larger than the sum of its proper divisors (7786333067).

20200111221 is a wasteful number, since it uses less digits than its factorization.

20200111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438632.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20200111221 its reverse (12211100202), we get a palindrome (32411211423).

The spelling of 20200111221 in words is "twenty billion, two hundred million, one hundred eleven thousand, two hundred twenty-one".