31231121021211 has 8 divisors (see below), whose sum is σ = 41648956013584. Its totient is φ = 20817016688160.

The previous prime is 31231121021147. The next prime is 31231121021257. The reversal of 31231121021211 is 11212012113213.

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

It is not a de Polignac number, because 31231121021211 - 2⁶ = 31231121021147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231121021411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932645296 + ... + 932678781.

It is an arithmetic number, because the mean of its divisors is an integer number (5206119501698).

Almost surely, 2^{31231121021211} is an apocalyptic number.

31231121021211 is a deficient number, since it is larger than the sum of its proper divisors (10417834992373).

31231121021211 is a wasteful number, since it uses less digits than its factorization.

31231121021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865329661.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 31231121021211 its reverse (11212012113213), we get a palindrome (42443133134424).

The spelling of 31231121021211 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty-one million, twenty-one thousand, two hundred eleven".