2181024 has 36 divisors (see below), whose sum is σ = 6203106. Its totient is φ = 726912.

The previous prime is 2181017. The next prime is 2181031. The reversal of 2181024 is 4201812.

It is an interprime number because it is at equal distance from previous prime (2181017) and next prime (2181031).

It can be written as a sum of positive squares in only one way, i.e., 1140624 + 1040400 = 1068^2 + 1020^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2180988 and 2181006.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3499 + ... + 4074.

2^2181024 is an apocalyptic number.

2181024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2181024 is an abundant number, since it is smaller than the sum of its proper divisors (4022082).

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

2181024 is a wasteful number, since it uses less digits than its factorization.

2181024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7589 (or 7578 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2181024 is about 1476.8290354675. The cubic root of 2181024 is about 129.6841246230.

Adding to 2181024 its reverse (4201812), we get a palindrome (6382836).

The spelling of 2181024 in words is "two million, one hundred eighty-one thousand, twenty-four".