31213421211 has 16 divisors (see below), whose sum is σ = 47567225600. Its totient is φ = 17834771808.

The previous prime is 31213421207. The next prime is 31213421243. The reversal of 31213421211 is 11212431213.

It is not a de Polignac number, because 31213421211 - 2² = 31213421207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213421111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232680 + ... + 341418.

It is an arithmetic number, because the mean of its divisors is an integer number (2972951600).

Almost surely, 2^31213421211 is an apocalyptic number.

31213421211 is a deficient number, since it is larger than the sum of its proper divisors (16353804389).

31213421211 is a wasteful number, since it uses less digits than its factorization.

31213421211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122418.

The product of its digits is 288, while the sum is 21.

Adding to 31213421211 its reverse (11212431213), we get a palindrome (42425852424).

The spelling of 31213421211 in words is "thirty-one billion, two hundred thirteen million, four hundred twenty-one thousand, two hundred eleven".