2123871387281 has 32 divisors (see below), whose sum is σ = 2546772295680. Its totient is φ = 1732641019200.

The previous prime is 2123871387247. The next prime is 2123871387293. The reversal of 2123871387281 is 1827831783212.

It is not a de Polignac number, because 2123871387281 - 2¹⁰ = 2123871386257 is a prime.

It is a super-2 number, since 2×2123871387281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123871587281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148028750 + ... + 148043096.

It is an arithmetic number, because the mean of its divisors is an integer number (79586634240).

Almost surely, 2^{2123871387281} is an apocalyptic number.

It is an amenable number.

2123871387281 is a deficient number, since it is larger than the sum of its proper divisors (422900908399).

2123871387281 is a wasteful number, since it uses less digits than its factorization.

2123871387281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24725.

The product of its digits is 1806336, while the sum is 53.

It can be divided in two parts, 2123871 and 387281, that added together give a palindrome (2511152).

The spelling of 2123871387281 in words is "two trillion, one hundred twenty-three billion, eight hundred seventy-one million, three hundred eighty-seven thousand, two hundred eighty-one".