20012111102221 has 16 divisors (see below), whose sum is σ = 24223571842176. Its totient is φ = 16139400270336.

The previous prime is 20012111102213. The next prime is 20012111102303. The reversal of 20012111102221 is 12220111121002.

It is not a de Polignac number, because 20012111102221 - 2³ = 20012111102213 is a prime.

It is a super-2 number, since 2×20012111102221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20012111102195 and 20012111102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012111102521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24724056 + ... + 25520641.

It is an arithmetic number, because the mean of its divisors is an integer number (1513973240136).

Almost surely, 2^{20012111102221} is an apocalyptic number.

It is an amenable number.

20012111102221 is a deficient number, since it is larger than the sum of its proper divisors (4211460739955).

20012111102221 is a wasteful number, since it uses less digits than its factorization.

20012111102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50248068.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20012111102221 its reverse (12220111121002), we get a palindrome (32232222223223).

The spelling of 20012111102221 in words is "twenty trillion, twelve billion, one hundred eleven million, one hundred two thousand, two hundred twenty-one".