31121102032131 has 4 divisors (see below), whose sum is σ = 41494802709512. Its totient is φ = 20747401354752.

The previous prime is 31121102032129. The next prime is 31121102032133. The reversal of 31121102032131 is 13123020112113.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (31121102032129) and next prime (31121102032133).

It is not a de Polignac number, because 31121102032131 - 2¹ = 31121102032129 is a prime.

It is a super-2 number, since 2×31121102032131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31121102032098 and 31121102032107.

It is not an unprimeable number, because it can be changed into a prime (31121102032133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5186850338686 + ... + 5186850338691.

It is an arithmetic number, because the mean of its divisors is an integer number (10373700677378).

Almost surely, 2^{31121102032131} is an apocalyptic number.

31121102032131 is a deficient number, since it is larger than the sum of its proper divisors (10373700677381).

31121102032131 is a wasteful number, since it uses less digits than its factorization.

31121102032131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10373700677380.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31121102032131 its reverse (13123020112113), we get a palindrome (44244122144244).

The spelling of 31121102032131 in words is "thirty-one trillion, one hundred twenty-one billion, one hundred two million, thirty-two thousand, one hundred thirty-one".