2121112131031 has 4 divisors (see below), whose sum is σ = 2129177196432. Its totient is φ = 2113047065632.

The previous prime is 2121112131029. The next prime is 2121112131043. The reversal of 2121112131031 is 1301312111212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121112131031 - 2¹ = 2121112131029 is a prime.

It is a super-2 number, since 2×2121112131031² (a number of 25 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 (2121112131631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4032532306 + ... + 4032532831.

It is an arithmetic number, because the mean of its divisors is an integer number (532294299108).

Almost surely, 2^{2121112131031} is an apocalyptic number.

2121112131031 is a deficient number, since it is larger than the sum of its proper divisors (8065065401).

2121112131031 is an equidigital number, since it uses as much as digits as its factorization.

2121112131031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8065065400.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 2121112131031 its reverse (1301312111212), we get a palindrome (3422424242243).

The spelling of 2121112131031 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, one hundred thirty-one thousand, thirty-one".