21425300520500 has 48 divisors (see below), whose sum is σ = 46845850344384. Its totient is φ = 8560414346400.

The previous prime is 21425300520493. The next prime is 21425300520521. The reversal of 21425300520500 is 502500352412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23822714 + ... + 24705713.

It is an arithmetic number, because the mean of its divisors is an integer number (975955215508).

Almost surely, 2^{21425300520500} is an apocalyptic number.

21425300520500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21425300520500 is an abundant number, since it is smaller than the sum of its proper divisors (25420549823884).

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

21425300520500 is a wasteful number, since it uses less digits than its factorization.

21425300520500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48529329 (or 48529317 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 21425300520500 its reverse (502500352412), we get a palindrome (21927800872912).

The spelling of 21425300520500 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred million, five hundred twenty thousand, five hundred".