20121673225 has 12 divisors (see below), whose sum is σ = 24983344540. Its totient is φ = 16076390400.

The previous prime is 20121673219. The next prime is 20121673237. The reversal of 20121673225 is 52237612102.

It can be written as a sum of positive squares in 6 ways, for example, as 282105616 + 19839567609 = 16796^2 + 140853^2 .

It is not a de Polignac number, because 20121673225 - 2⁷ = 20121673097 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 504096 + ... + 542545.

Almost surely, 2^20121673225 is an apocalyptic number.

20121673225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20121673225 is a deficient number, since it is larger than the sum of its proper divisors (4861671315).

20121673225 is a wasteful number, since it uses less digits than its factorization.

20121673225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047420 (or 1047415 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 20121673225 in words is "twenty billion, one hundred twenty-one million, six hundred seventy-three thousand, two hundred twenty-five".