20122211 has 4 divisors (see below), whose sum is σ = 20134800. Its totient is φ = 20109624.

The previous prime is 20122199. The next prime is 20122213. The reversal of 20122211 is 11222102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11222102 = 2 ⋅5611051.

It is a cyclic number.

It is not a de Polignac number, because 20122211 - 2⁶ = 20122147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122192 and 20122201.

It is not an unprimeable number, because it can be changed into a prime (20122213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (5033700).

Almost surely, 2^20122211 is an apocalyptic number.

20122211 is a deficient number, since it is larger than the sum of its proper divisors (12589).

20122211 is a wasteful number, since it uses less digits than its factorization.

20122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12588.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20122211 is about 4485.7787506742. The cubic root of 20122211 is about 271.9935254730.

Adding to 20122211 its reverse (11222102), we get a palindrome (31344313).

The spelling of 20122211 in words is "twenty million, one hundred twenty-two thousand, two hundred eleven".