20213211 has 8 divisors (see below), whose sum is σ = 27679504. Its totient is φ = 13111200.

The previous prime is 20213197. The next prime is 20213233. The reversal of 20213211 is 11231202.

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

It is not a de Polignac number, because 20213211 - 2¹⁰ = 20212187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90940 + ... + 91161.

It is an arithmetic number, because the mean of its divisors is an integer number (3459938).

Almost surely, 2^20213211 is an apocalyptic number.

20213211 is a deficient number, since it is larger than the sum of its proper divisors (7466293).

20213211 is a wasteful number, since it uses less digits than its factorization.

20213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182141.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20213211 is about 4495.9104750873. The cubic root of 20213211 is about 272.4029270150.

Adding to 20213211 its reverse (11231202), we get a palindrome (31444413).

Subtracting from 20213211 its reverse (11231202), we obtain a square (8982009 = 2997²).

The spelling of 20213211 in words is "twenty million, two hundred thirteen thousand, two hundred eleven".