20011220222221 has 8 divisors (see below), whose sum is σ = 21064959807200. Its totient is φ = 18957532384080.

The previous prime is 20011220222177. The next prime is 20011220222249. The reversal of 20011220222221 is 12222202211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20011220222221 - 2³⁷ = 19873781268749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011220222251) 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 7 ways as a sum of consecutive naturals, for example, 12141666 + ... + 13690963.

It is an arithmetic number, because the mean of its divisors is an integer number (2633119975900).

Almost surely, 2^{20011220222221} is an apocalyptic number.

It is an amenable number.

20011220222221 is a deficient number, since it is larger than the sum of its proper divisors (1053739584979).

20011220222221 is a wasteful number, since it uses less digits than its factorization.

20011220222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25873419.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20011220222221 its reverse (12222202211002), we get a palindrome (32233422433223).

The spelling of 20011220222221 in words is "twenty trillion, eleven billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".