20213131211 has 16 divisors (see below), whose sum is σ = 24939784128. Its totient is φ = 15952896000.

The previous prime is 20213131207. The next prime is 20213131231. The reversal of 20213131211 is 11213131202.

It is a cyclic number.

It is not a de Polignac number, because 20213131211 - 2² = 20213131207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20213131211.

It is not an unprimeable number, because it can be changed into a prime (20213131231) 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, 240470 + ... + 313451.

It is an arithmetic number, because the mean of its divisors is an integer number (1558736508).

Almost surely, 2^20213131211 is an apocalyptic number.

20213131211 is a deficient number, since it is larger than the sum of its proper divisors (4726652917).

20213131211 is a wasteful number, since it uses less digits than its factorization.

20213131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554342.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20213131211 its reverse (11213131202), we get a palindrome (31426262413).

Subtracting from 20213131211 its reverse (11213131202), we obtain a palindrome (9000000009).

The spelling of 20213131211 in words is "twenty billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred eleven".