2187219924 has 36 divisors (see below), whose sum is σ = 5678236564. Its totient is φ = 709368192.

The previous prime is 2187219919. The next prime is 2187219929. The reversal of 2187219924 is 4299127812.

It is an interprime number because it is at equal distance from previous prime (2187219919) and next prime (2187219929).

It can be written as a sum of positive squares in 2 ways, for example, as 1543075524 + 644144400 = 39282^2 + 25380^2 .

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

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2187219924.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187219929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 819697 + ... + 822360.

Almost surely, 2^2187219924 is an apocalyptic number.

It is an amenable number.

2187219924 is an abundant number, since it is smaller than the sum of its proper divisors (3491016640).

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

2187219924 is a wasteful number, since it uses less digits than its factorization.

2187219924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642104 (or 1642099 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 2187219924 is about 46767.7231004461. The cubic root of 2187219924 is about 1298.0681214609.

It can be divided in two parts, 2187 and 219924, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 2187219924 in words is "two billion, one hundred eighty-seven million, two hundred nineteen thousand, nine hundred twenty-four".