2121103211031 has 24 divisors (see below), whose sum is σ = 3504974089760. Its totient is φ = 1210857693696.

The previous prime is 2121103210999. The next prime is 2121103211039. The reversal of 2121103211031 is 1301123011212.

It is not a de Polignac number, because 2121103211031 - 2⁵ = 2121103210999 is a prime.

It is a super-2 number, since 2×2121103211031² (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 = 2121103210995 and 2121103211013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121103211039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16620430 + ... + 16747563.

Almost surely, 2^{2121103211031} is an apocalyptic number.

2121103211031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2121103211031 is a deficient number, since it is larger than the sum of its proper divisors (1383870878729).

2121103211031 is a wasteful number, since it uses less digits than its factorization.

2121103211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33369015 (or 33369012 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 2121103211031 its reverse (1301123011212), we get a palindrome (3422226222243).

The spelling of 2121103211031 in words is "two trillion, one hundred twenty-one billion, one hundred three million, two hundred eleven thousand, thirty-one".