20112121111221 has 12 divisors (see below), whose sum is σ = 29322344799072. Its totient is φ = 13282771574376.

The previous prime is 20112121111213. The next prime is 20112121111231. The reversal of 20112121111221 is 12211112121102.

It is a happy number.

20112121111221 is a `hidden beast` number, since 201 + 1 + 21 + 211 + 11 + 221 = 666.

It is not a de Polignac number, because 20112121111221 - 2³ = 20112121111213 is a prime.

It is a super-2 number, since 2×20112121111221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20112121111194 and 20112121111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112121111231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10442429521 + ... + 10442431446.

It is an arithmetic number, because the mean of its divisors is an integer number (2443528733256).

Almost surely, 2^{20112121111221} is an apocalyptic number.

It is an amenable number.

20112121111221 is a deficient number, since it is larger than the sum of its proper divisors (9210223687851).

20112121111221 is a wasteful number, since it uses less digits than its factorization.

20112121111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20884861080 (or 20884861077 counting only the distinct ones).

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

Adding to 20112121111221 its reverse (12211112121102), we get a palindrome (32323233232323).

The spelling of 20112121111221 in words is "twenty trillion, one hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".