20421201123225 has 144 divisors (see below), whose sum is σ = 42529958575104. Its totient is φ = 9174190896000.

The previous prime is 20421201123163. The next prime is 20421201123227. The reversal of 20421201123225 is 52232110212402.

20421201123225 is a `hidden beast` number, since 2 + 0 + 421 + 2 + 0 + 1 + 1 + 232 + 2 + 5 = 666.

It is not a de Polignac number, because 20421201123225 - 2⁸ = 20421201122969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20421201123227) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 20771010 + ... + 21731940.

Almost surely, 2^{20421201123225} is an apocalyptic number.

20421201123225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20421201123225 is an abundant number, since it is smaller than the sum of its proper divisors (22108757451879).

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

20421201123225 is a wasteful number, since it uses less digits than its factorization.

20421201123225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961188 (or 961180 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 20421201123225 its reverse (52232110212402), we get a palindrome (72653311335627).

The spelling of 20421201123225 in words is "twenty trillion, four hundred twenty-one billion, two hundred one million, one hundred twenty-three thousand, two hundred twenty-five".