2181207015 has 128 divisors (see below), whose sum is σ = 4575916800. Its totient is φ = 975421440.

The previous prime is 2181207013. The next prime is 2181207031. The reversal of 2181207015 is 5107021812.

It is not a de Polignac number, because 2181207015 - 2¹ = 2181207013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2181207015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181207013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 863955 + ... + 866475.

It is an arithmetic number, because the mean of its divisors is an integer number (35749350).

Almost surely, 2^2181207015 is an apocalyptic number.

2181207015 is an abundant number, since it is smaller than the sum of its proper divisors (2394709785).

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

2181207015 is a wasteful number, since it uses less digits than its factorization.

2181207015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594 (or 2588 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 2181207015 is about 46703.3940415469. The cubic root of 2181207015 is about 1296.8775189113.

Adding to 2181207015 its reverse (5107021812), we get a palindrome (7288228827).

The spelling of 2181207015 in words is "two billion, one hundred eighty-one million, two hundred seven thousand, fifteen".