20211122221 has 16 divisors (see below), whose sum is σ = 21148076160. Its totient is φ = 19290779200.

The previous prime is 20211122209. The next prime is 20211122227. The reversal of 20211122221 is 12222111202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20211122221 - 2²⁵ = 20177567789 is a prime.

It is a super-2 number, since 2×20211122221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211122195 and 20211122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211122227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995456 + ... + 2005558.

It is an arithmetic number, because the mean of its divisors is an integer number (1321754760).

Almost surely, 2^20211122221 is an apocalyptic number.

It is an amenable number.

20211122221 is a deficient number, since it is larger than the sum of its proper divisors (936953939).

20211122221 is a wasteful number, since it uses less digits than its factorization.

20211122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10916.

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

Adding to 20211122221 its reverse (12222111202), we get a palindrome (32433233423).

The spelling of 20211122221 in words is "twenty billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".