31213011211231 has 8 divisors (see below), whose sum is σ = 33020905808000. Its totient is φ = 29421627067800.

The previous prime is 31213011211201. The next prime is 31213011211387. The reversal of 31213011211231 is 13211211031213.

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

It is not a de Polignac number, because 31213011211231 - 2²³ = 31213002822623 is a prime.

It is a super-2 number, since 2×31213011211231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213011211201) 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, 4127609445 + ... + 4127617006.

It is an arithmetic number, because the mean of its divisors is an integer number (4127613226000).

Almost surely, 2^{31213011211231} is an apocalyptic number.

31213011211231 is a deficient number, since it is larger than the sum of its proper divisors (1807894596769).

31213011211231 is a wasteful number, since it uses less digits than its factorization.

31213011211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8255226669.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31213011211231 its reverse (13211211031213), we get a palindrome (44424222242444).

The spelling of 31213011211231 in words is "thirty-one trillion, two hundred thirteen billion, eleven million, two hundred eleven thousand, two hundred thirty-one".