20112102212221 has 4 divisors (see below), whose sum is σ = 21295167048252. Its totient is φ = 18929037376192.

The previous prime is 20112102212207. The next prime is 20112102212273. The reversal of 20112102212221 is 12221220121102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17989355200996 + 2122747011225 = 4241386^2 + 1456965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112102212221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112102212281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591532417990 + ... + 591532418023.

It is an arithmetic number, because the mean of its divisors is an integer number (5323791762063).

Almost surely, 2^{20112102212221} is an apocalyptic number.

It is an amenable number.

20112102212221 is a deficient number, since it is larger than the sum of its proper divisors (1183064836031).

20112102212221 is a wasteful number, since it uses less digits than its factorization.

20112102212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183064836030.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20112102212221 its reverse (12221220121102), we get a palindrome (32333322333323).

The spelling of 20112102212221 in words is "twenty trillion, one hundred twelve billion, one hundred two million, two hundred twelve thousand, two hundred twenty-one".