20111112112221 has 24 divisors (see below), whose sum is σ = 31285471553336. Its totient is φ = 12375467919360.

The previous prime is 20111112112219. The next prime is 20111112112309. The reversal of 20111112112221 is 12221121111102.

It is a happy number.

20111112112221 is a `hidden beast` number, since 201 + 111 + 121 + 12 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2748798202500 + 17362313909721 = 1657950^2 + 4166811^2 .

It is not a de Polignac number, because 20111112112221 - 2¹ = 20111112112219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20111112112194 and 20111112112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111112117221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1748800 + ... + 6578793.

Almost surely, 2^{20111112112221} is an apocalyptic number.

It is an amenable number.

20111112112221 is a deficient number, since it is larger than the sum of its proper divisors (11174359441115).

20111112112221 is a wasteful number, since it uses less digits than its factorization.

20111112112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8348253 (or 8348250 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 20111112112221 its reverse (12221121111102), we get a palindrome (32332233223323).

The spelling of 20111112112221 in words is "twenty trillion, one hundred eleven billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".