2181072 has 20 divisors (see below), whose sum is σ = 5634560. Its totient is φ = 727008.

The previous prime is 2181071. The next prime is 2181073. The reversal of 2181072 is 2701812.

It is an interprime number because it is at equal distance from previous prime (2181071) and next prime (2181073).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22672 + ... + 22767.

It is an arithmetic number, because the mean of its divisors is an integer number (281728).

2^2181072 is an apocalyptic number.

It is an amenable number.

2181072 is an abundant number, since it is smaller than the sum of its proper divisors (3453488).

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

2181072 is a wasteful number, since it uses less digits than its factorization.

2181072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45450 (or 45444 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 2181072 is about 1476.8452864129. The cubic root of 2181072 is about 129.6850759793.

Adding to 2181072 its reverse (2701812), we get a palindrome (4882884).

The spelling of 2181072 in words is "two million, one hundred eighty-one thousand, seventy-two".