2181324637632 has 112 divisors (see below), whose sum is σ = 6774178211840. Its totient is φ = 606391391232.

The previous prime is 2181324637607. The next prime is 2181324637633. The reversal of 2181324637632 is 2367364231812.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×2181324637632² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181324637633) 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 15 ways as a sum of consecutive naturals, for example, 21882832 + ... + 21982287.

Almost surely, 2^{2181324637632} is an apocalyptic number.

It is an amenable number.

2181324637632 is an abundant number, since it is smaller than the sum of its proper divisors (4592853574208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2181324637632 is a wasteful number, since it uses less digits than its factorization.

2181324637632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43865178 (or 43865168 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 48.

The spelling of 2181324637632 in words is "two trillion, one hundred eighty-one billion, three hundred twenty-four million, six hundred thirty-seven thousand, six hundred thirty-two".