11841781733721 has 27 divisors (see below), whose sum is σ = 17259205515487. Its totient is φ = 7823887310400.

The previous prime is 11841781733713. The next prime is 11841781733753. The reversal of 11841781733721 is 12733718714811.

The square root of 11841781733721 is 3441189.

It is a perfect power (a square), and thus also a powerful number.

11841781733721 is a `hidden beast` number, since 1 + 1 + 8 + 417 + 8 + 173 + 37 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 208661672025 + 11633120061696 = 456795^2 + 3410736^2 .

It is not a de Polignac number, because 11841781733721 - 2³ = 11841781733713 is a prime.

It is a super-4 number, since 4×11841781733721⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11841781732721) 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 26 ways as a sum of consecutive naturals, for example, 1166557996 + ... + 1166568146.

Almost surely, 2^{11841781733721} is an apocalyptic number.

11841781733721 is the 3441189-th square number.

11841781733721 is the 1720595-th centered octagonal number.

It is an amenable number.

11841781733721 is a deficient number, since it is larger than the sum of its proper divisors (5417423781766).

11841781733721 is an frugal number, since it uses more digits than its factorization.

11841781733721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20534 (or 10267 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The spelling of 11841781733721 in words is "eleven trillion, eight hundred forty-one billion, seven hundred eighty-one million, seven hundred thirty-three thousand, seven hundred twenty-one".