20221211 has 4 divisors (see below), whose sum is σ = 21410712. Its totient is φ = 19031712.

The previous prime is 20221193. The next prime is 20221213. The reversal of 20221211 is 11212202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20221211 - 2⁶ = 20221147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221192 and 20221201.

It is not an unprimeable number, because it can be changed into a prime (20221213) 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, 594725 + ... + 594758.

It is an arithmetic number, because the mean of its divisors is an integer number (5352678).

Almost surely, 2^20221211 is an apocalyptic number.

20221211 is a deficient number, since it is larger than the sum of its proper divisors (1189501).

20221211 is a wasteful number, since it uses less digits than its factorization.

20221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189500.

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

The square root of 20221211 is about 4496.8000845045. The cubic root of 20221211 is about 272.4388595541.

Adding to 20221211 its reverse (11212202), we get a palindrome (31433413).

Subtracting from 20221211 its reverse (11212202), we obtain a palindrome (9009009).

The spelling of 20221211 in words is "twenty million, two hundred twenty-one thousand, two hundred eleven".