2121012313031 has 4 divisors (see below), whose sum is σ = 2121025250064. Its totient is φ = 2120999376000.

The previous prime is 2121012313003. The next prime is 2121012313039. The reversal of 2121012313031 is 1303132101212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121012313031 is a prime.

It is a super-2 number, since 2×2121012313031² (a number of 25 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 = 2121012312994 and 2121012313012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121012313039) 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, 6219395 + ... + 6551556.

It is an arithmetic number, because the mean of its divisors is an integer number (530256312516).

Almost surely, 2^{2121012313031} is an apocalyptic number.

2121012313031 is a deficient number, since it is larger than the sum of its proper divisors (12937033).

2121012313031 is a wasteful number, since it uses less digits than its factorization.

2121012313031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12937032.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 2121012313031 its reverse (1303132101212), we get a palindrome (3424144414243).

The spelling of 2121012313031 in words is "two trillion, one hundred twenty-one billion, twelve million, three hundred thirteen thousand, thirty-one".