20011122221 has 8 divisors (see below), whose sum is σ = 21065980800. Its totient is φ = 18956427840.

The previous prime is 20011122199. The next prime is 20011122227. The reversal of 20011122221 is 12222111002.

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

It is a cyclic number.

It is not a de Polignac number, because 20011122221 - 2¹⁴ = 20011105837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011122196 and 20011122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011122227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269381 + ... + 335541.

It is an arithmetic number, because the mean of its divisors is an integer number (2633247600).

Almost surely, 2^20011122221 is an apocalyptic number.

It is an amenable number.

20011122221 is a deficient number, since it is larger than the sum of its proper divisors (1054858579).

20011122221 is a wasteful number, since it uses less digits than its factorization.

20011122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82099.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20011122221 its reverse (12222111002), we get a palindrome (32233233223).

The spelling of 20011122221 in words is "twenty billion, eleven million, one hundred twenty-two thousand, two hundred twenty-one".