2120405205 has 8 divisors (see below), whose sum is σ = 3392648352. Its totient is φ = 1130882768.

The previous prime is 2120405171. The next prime is 2120405219. The reversal of 2120405205 is 5025040212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2120405205 - 2¹¹ = 2120403157 is a prime.

It is a super-2 number, since 2×2120405205² = 8992236466782184050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70680159 + ... + 70680188.

It is an arithmetic number, because the mean of its divisors is an integer number (424081044).

Almost surely, 2^2120405205 is an apocalyptic number.

It is an amenable number.

2120405205 is a deficient number, since it is larger than the sum of its proper divisors (1272243147).

2120405205 is a wasteful number, since it uses less digits than its factorization.

2120405205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141360355.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 2120405205 is about 46047.8577677616. The cubic root of 2120405205 is about 1284.7134982801.

Adding to 2120405205 its reverse (5025040212), we get a palindrome (7145445417).

The spelling of 2120405205 in words is "two billion, one hundred twenty million, four hundred five thousand, two hundred five".