2125220405 has 72 divisors (see below), whose sum is σ = 3453479064. Its totient is φ = 1246586880.

The previous prime is 2125220399. The next prime is 2125220417. The reversal of 2125220405 is 5040225212.

It can be written as a sum of positive squares in 4 ways, for example, as 865183396 + 1260037009 = 29414^2 + 35497^2 .

It is not a de Polignac number, because 2125220405 - 2¹⁶ = 2125154869 is a prime.

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 71 ways as a sum of consecutive naturals, for example, 501857 + ... + 506073.

It is an arithmetic number, because the mean of its divisors is an integer number (47964987).

Almost surely, 2^2125220405 is an apocalyptic number.

It is an amenable number.

2125220405 is a deficient number, since it is larger than the sum of its proper divisors (1328258659).

2125220405 is a wasteful number, since it uses less digits than its factorization.

2125220405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4275 (or 4257 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 2125220405 is about 46100.1128523564. The cubic root of 2125220405 is about 1285.6852426802.

Adding to 2125220405 its reverse (5040225212), we get a palindrome (7165445617).

The spelling of 2125220405 in words is "two billion, one hundred twenty-five million, two hundred twenty thousand, four hundred five".