20111220002221 has 4 divisors (see below), whose sum is σ = 20310340992444. Its totient is φ = 19912099012000.

The previous prime is 20111220002197. The next prime is 20111220002233. The reversal of 20111220002221 is 12220002211102.

It is a happy number.

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 8792772798121 + 11318447204100 = 2965261^2 + 3364290^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111220002221 - 2¹⁹ = 20111219477933 is a prime.

It is a super-3 number, since 3×20111220002221³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111220002195 and 20111220002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111220002921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99560494960 + ... + 99560495161.

It is an arithmetic number, because the mean of its divisors is an integer number (5077585248111).

Almost surely, 2^{20111220002221} is an apocalyptic number.

It is an amenable number.

20111220002221 is a deficient number, since it is larger than the sum of its proper divisors (199120990223).

20111220002221 is a wasteful number, since it uses less digits than its factorization.

20111220002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199120990222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20111220002221 its reverse (12220002211102), we get a palindrome (32331222213323).

The spelling of 20111220002221 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, two thousand, two hundred twenty-one".