2123121210031 has 4 divisors (see below), whose sum is σ = 2248010692992. Its totient is φ = 1998231727072.

The previous prime is 2123121210029. The next prime is 2123121210037. The reversal of 2123121210031 is 1300121213212.

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 2123121210031 - 2¹ = 2123121210029 is a prime.

It is a super-2 number, since 2×2123121210031² (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 = 2123121209990 and 2123121210008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123121210037) 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, 62444741455 + ... + 62444741488.

It is an arithmetic number, because the mean of its divisors is an integer number (562002673248).

Almost surely, 2^{2123121210031} is an apocalyptic number.

2123121210031 is a deficient number, since it is larger than the sum of its proper divisors (124889482961).

2123121210031 is a wasteful number, since it uses less digits than its factorization.

2123121210031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124889482960.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2123121210031 its reverse (1300121213212), we get a palindrome (3423242423243).

The spelling of 2123121210031 in words is "two trillion, one hundred twenty-three billion, one hundred twenty-one million, two hundred ten thousand, thirty-one".