2181457236 has 48 divisors (see below), whose sum is σ = 5827570560. Its totient is φ = 622164480.

The previous prime is 2181457231. The next prime is 2181457249. The reversal of 2181457236 is 6327541812.

It is a junction number, because it is equal to n+sod(n) for n = 2181457194 and 2181457203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181457231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24976 + ... + 70616.

It is an arithmetic number, because the mean of its divisors is an integer number (121407720).

Almost surely, 2^2181457236 is an apocalyptic number.

It is an amenable number.

2181457236 is an abundant number, since it is smaller than the sum of its proper divisors (3646113324).

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

2181457236 is a wasteful number, since it uses less digits than its factorization.

2181457236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46224 (or 46222 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 2181457236 is about 46706.0727957297. The cubic root of 2181457236 is about 1296.9271082104.

The spelling of 2181457236 in words is "two billion, one hundred eighty-one million, four hundred fifty-seven thousand, two hundred thirty-six".