2126186481821 has 4 divisors (see below), whose sum is σ = 2132109007200. Its totient is φ = 2120263956444.

The previous prime is 2126186481773. The next prime is 2126186481847. The reversal of 2126186481821 is 1281846816212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126186481821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2126186481821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126186481871) 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, 2961262151 + ... + 2961262868.

It is an arithmetic number, because the mean of its divisors is an integer number (533027251800).

Almost surely, 2^{2126186481821} is an apocalyptic number.

It is an amenable number.

2126186481821 is a deficient number, since it is larger than the sum of its proper divisors (5922525379).

2126186481821 is an equidigital number, since it uses as much as digits as its factorization.

2126186481821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922525378.

The product of its digits is 589824, while the sum is 50.

The spelling of 2126186481821 in words is "two trillion, one hundred twenty-six billion, one hundred eighty-six million, four hundred eighty-one thousand, eight hundred twenty-one".