1821387704135 has 32 divisors (see below), whose sum is σ = 2312463973248. Its totient is φ = 1374351390720.

The previous prime is 1821387704131. The next prime is 1821387704197. The reversal of 1821387704135 is 5314077831281.

It is not a de Polignac number, because 1821387704135 - 2² = 1821387704131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821387704131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40785779 + ... + 40830411.

It is an arithmetic number, because the mean of its divisors is an integer number (72264499164).

Almost surely, 2^{1821387704135} is an apocalyptic number.

1821387704135 is a deficient number, since it is larger than the sum of its proper divisors (491076269113).

1821387704135 is a wasteful number, since it uses less digits than its factorization.

1821387704135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49595.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 1821387704135 in words is "one trillion, eight hundred twenty-one billion, three hundred eighty-seven million, seven hundred four thousand, one hundred thirty-five".