2120621782 has 16 divisors (see below), whose sum is σ = 3191977152. Its totient is φ = 1056636360.

The previous prime is 2120621777. The next prime is 2120621791. The reversal of 2120621782 is 2871260212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384357 + ... + 1385887.

It is an arithmetic number, because the mean of its divisors is an integer number (199498572).

Almost surely, 2^2120621782 is an apocalyptic number.

2120621782 is a deficient number, since it is larger than the sum of its proper divisors (1071355370).

2120621782 is a wasteful number, since it uses less digits than its factorization.

2120621782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 2120621782 is about 46050.2093589161. The cubic root of 2120621782 is about 1284.7572367634.

Adding to 2120621782 its reverse (2871260212), we get a palindrome (4991881994).

The spelling of 2120621782 in words is "two billion, one hundred twenty million, six hundred twenty-one thousand, seven hundred eighty-two".