20121225100 has 36 divisors (see below), whose sum is σ = 44086994224. Its totient is φ = 7970345280.

The previous prime is 20121225097. The next prime is 20121225101. The reversal of 20121225100 is 152212102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20121225101) 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 11 ways as a sum of consecutive naturals, for example, 966459 + ... + 987058.

Almost surely, 2^20121225100 is an apocalyptic number.

20121225100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121225100 is an abundant number, since it is smaller than the sum of its proper divisors (23965769124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121225100 is a wasteful number, since it uses less digits than its factorization.

20121225100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953634 (or 1953627 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20121225100 its reverse (152212102), we get a palindrome (20273437202).

The spelling of 20121225100 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-five thousand, one hundred".