2120552905 has 4 divisors (see below), whose sum is σ = 2544663492. Its totient is φ = 1696442320.

The previous prime is 2120552899. The next prime is 2120552921. The reversal of 2120552905 is 5092550212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 276623424 + 1843929481 = 16632^2 + 42941^2 .

It is not a de Polignac number, because 2120552905 - 2³ = 2120552897 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212055286 + ... + 212055295.

It is an arithmetic number, because the mean of its divisors is an integer number (636165873).

Almost surely, 2^2120552905 is an apocalyptic number.

It is an amenable number.

2120552905 is a deficient number, since it is larger than the sum of its proper divisors (424110587).

2120552905 is an equidigital number, since it uses as much as digits as its factorization.

2120552905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424110586.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 2120552905 is about 46049.4615060806. The cubic root of 2120552905 is about 1284.7433271351.

It can be divided in two parts, 2120 and 552905, that added together give a square (555025 = 745²).

The spelling of 2120552905 in words is "two billion, one hundred twenty million, five hundred fifty-two thousand, nine hundred five".