20121033225 has 24 divisors (see below), whose sum is σ = 33640570080. Its totient is φ = 10610638720.

The previous prime is 20121033209. The next prime is 20121033227. The reversal of 20121033225 is 52233012102.

It is not a de Polignac number, because 20121033225 - 2⁴ = 20121033209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20121033227) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1500519 + ... + 1513868.

It is an arithmetic number, because the mean of its divisors is an integer number (1401690420).

Almost surely, 2^20121033225 is an apocalyptic number.

20121033225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20121033225 is a deficient number, since it is larger than the sum of its proper divisors (13519536855).

20121033225 is a wasteful number, since it uses less digits than its factorization.

20121033225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014489 (or 3014484 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20121033225 its reverse (52233012102), we get a palindrome (72354045327).

The spelling of 20121033225 in words is "twenty billion, one hundred twenty-one million, thirty-three thousand, two hundred twenty-five".