20111202221 has 16 divisors (see below), whose sum is σ = 22129041408. Its totient is φ = 18125175600.

The previous prime is 20111202217. The next prime is 20111202247. The reversal of 20111202221 is 12220211102.

It is a cyclic number.

It is not a de Polignac number, because 20111202221 - 2² = 20111202217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111202196 and 20111202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111201221) 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, 2134106 + ... + 2143508.

It is an arithmetic number, because the mean of its divisors is an integer number (1383065088).

Almost surely, 2^20111202221 is an apocalyptic number.

It is an amenable number.

20111202221 is a deficient number, since it is larger than the sum of its proper divisors (2017839187).

20111202221 is a wasteful number, since it uses less digits than its factorization.

20111202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11072.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20111202221 its reverse (12220211102), we get a palindrome (32331413323).

The spelling of 20111202221 in words is "twenty billion, one hundred eleven million, two hundred two thousand, two hundred twenty-one".