2151224225 has 12 divisors (see below), whose sum is σ = 2704061676. Its totient is φ = 1697402880.

The previous prime is 2151224219. The next prime is 2151224239. The reversal of 2151224225 is 5224221512.

It can be written as a sum of positive squares in 6 ways, for example, as 6330256 + 2144893969 = 2516^2 + 46313^2 .

It is not a de Polignac number, because 2151224225 - 2¹² = 2151220129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2151224194 and 2151224203.

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 11 ways as a sum of consecutive naturals, for example, 587552 + ... + 591201.

It is an arithmetic number, because the mean of its divisors is an integer number (225338473).

Almost surely, 2^2151224225 is an apocalyptic number.

2151224225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2151224225 is a deficient number, since it is larger than the sum of its proper divisors (552837451).

2151224225 is a wasteful number, since it uses less digits than its factorization.

2151224225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178836 (or 1178831 counting only the distinct ones).

The product of its digits is 3200, while the sum is 26.

The square root of 2151224225 is about 46381.2917564830. The cubic root of 2151224225 is about 1290.9078050090.

Adding to 2151224225 its reverse (5224221512), we get a palindrome (7375445737).

The spelling of 2151224225 in words is "two billion, one hundred fifty-one million, two hundred twenty-four thousand, two hundred twenty-five".