20121012225 has 24 divisors (see below), whose sum is σ = 36963045920. Its totient is φ = 10731206160.

The previous prime is 20121012211. The next prime is 20121012227. The reversal of 20121012225 is 52221012102.

It is not a de Polignac number, because 20121012225 - 2¹⁰ = 20121011201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121012198 and 20121012207.

It is not an unprimeable number, because it can be changed into a prime (20121012227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14903779 + ... + 14905128.

Almost surely, 2^20121012225 is an apocalyptic number.

20121012225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20121012225 is a deficient number, since it is larger than the sum of its proper divisors (16842033695).

20121012225 is a wasteful number, since it uses less digits than its factorization.

20121012225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29808926 (or 29808915 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 20121012225 its reverse (52221012102), we get a palindrome (72342024327).

The spelling of 20121012225 in words is "twenty billion, one hundred twenty-one million, twelve thousand, two hundred twenty-five".