2151220084 has 24 divisors (see below), whose sum is σ = 4230495360. Its totient is φ = 949701984.

The previous prime is 2151220073. The next prime is 2151220091. The reversal of 2151220084 is 4800221512.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 898144 + ... + 900535.

It is an arithmetic number, because the mean of its divisors is an integer number (176270640).

Almost surely, 2^2151220084 is an apocalyptic number.

It is an amenable number.

2151220084 is a deficient number, since it is larger than the sum of its proper divisors (2079275276).

2151220084 is a wasteful number, since it uses less digits than its factorization.

2151220084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798719 (or 1798717 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 2151220084 is about 46381.2471156178. The cubic root of 2151220084 is about 1290.9069766973.

Adding to 2151220084 its reverse (4800221512), we get a palindrome (6951441596).

The spelling of 2151220084 in words is "two billion, one hundred fifty-one million, two hundred twenty thousand, eighty-four".