20212211 has 4 divisors (see below), whose sum is σ = 20228424. Its totient is φ = 20196000.

The previous prime is 20212187. The next prime is 20212223. The reversal of 20212211 is 11221202.

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 20212211 - 2¹⁰ = 20211187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212192 and 20212201.

It is not an unprimeable number, because it can be changed into a prime (20212261) 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, 6065 + ... + 8786.

It is an arithmetic number, because the mean of its divisors is an integer number (5057106).

Almost surely, 2^20212211 is an apocalyptic number.

20212211 is a deficient number, since it is larger than the sum of its proper divisors (16213).

20212211 is a wasteful number, since it uses less digits than its factorization.

20212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16212.

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

The square root of 20212211 is about 4495.7992615329. The cubic root of 20212211 is about 272.3984347811.

Adding to 20212211 its reverse (11221202), we get a palindrome (31433413).

The spelling of 20212211 in words is "twenty million, two hundred twelve thousand, two hundred eleven".