2121001110031 has 4 divisors (see below), whose sum is σ = 2172732844464. Its totient is φ = 2069269375600.

The previous prime is 2121001110029. The next prime is 2121001110089. The reversal of 2121001110031 is 1300111001212.

It is a happy number.

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 2121001110031 - 2¹ = 2121001110029 is a prime.

It is a super-2 number, since 2×2121001110031² (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 = 2121001109993 and 2121001110020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121001117031) 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, 25865867155 + ... + 25865867236.

It is an arithmetic number, because the mean of its divisors is an integer number (543183211116).

Almost surely, 2^{2121001110031} is an apocalyptic number.

2121001110031 is a deficient number, since it is larger than the sum of its proper divisors (51731734433).

2121001110031 is an equidigital number, since it uses as much as digits as its factorization.

2121001110031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51731734432.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 2121001110031 its reverse (1300111001212), we get a palindrome (3421112111243).

The spelling of 2121001110031 in words is "two trillion, one hundred twenty-one billion, one million, one hundred ten thousand, thirty-one".