21503055504225 has 24 divisors (see below), whose sum is σ = 35594092457280. Its totient is φ = 11454627229120.

The previous prime is 21503055504221. The next prime is 21503055504251. The reversal of 21503055504225 is 52240555030512.

It is not a de Polignac number, because 21503055504225 - 2² = 21503055504221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21503055504221) 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, 170799654 + ... + 170925503.

It is an arithmetic number, because the mean of its divisors is an integer number (1483087185720).

Almost surely, 2^{21503055504225} is an apocalyptic number.

21503055504225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21503055504225 is a deficient number, since it is larger than the sum of its proper divisors (14091036953055).

21503055504225 is a wasteful number, since it uses less digits than its factorization.

21503055504225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341726009 (or 341726004 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 39.

The spelling of 21503055504225 in words is "twenty-one trillion, five hundred three billion, fifty-five million, five hundred four thousand, two hundred twenty-five".