31212113111031 has 32 divisors (see below), whose sum is σ = 42551785209600. Its totient is φ = 20345306699520.

The previous prime is 31212113111029. The next prime is 31212113111057. The reversal of 31212113111031 is 13011131121213.

It is not a de Polignac number, because 31212113111031 - 2¹ = 31212113111029 is a prime.

It is a super-2 number, since 2×31212113111031² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31212113110989 and 31212113111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212113112031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18662875 + ... + 20266403.

It is an arithmetic number, because the mean of its divisors is an integer number (1329743287800).

Almost surely, 2^{31212113111031} is an apocalyptic number.

31212113111031 is a deficient number, since it is larger than the sum of its proper divisors (11339672098569).

31212113111031 is a wasteful number, since it uses less digits than its factorization.

31212113111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604319.

The product of its (nonzero) digits is 108, while the sum is 21.

Adding to 31212113111031 its reverse (13011131121213), we get a palindrome (44223244232244).

The spelling of 31212113111031 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, one hundred eleven thousand, thirty-one".