21500032141225 has 24 divisors (see below), whose sum is σ = 29103239023488. Its totient is φ = 15625871323200.

The previous prime is 21500032141223. The next prime is 21500032141271. The reversal of 21500032141225 is 52214123000512.

It is a happy number.

It is not a de Polignac number, because 21500032141225 - 2¹ = 21500032141223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21500032141193 and 21500032141202.

It is not an unprimeable number, because it can be changed into a prime (21500032141223) 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, 25879554 + ... + 26697403.

It is an arithmetic number, because the mean of its divisors is an integer number (1212634959312).

Almost surely, 2^{21500032141225} is an apocalyptic number.

21500032141225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21500032141225 is a deficient number, since it is larger than the sum of its proper divisors (7603206882263).

21500032141225 is a wasteful number, since it uses less digits than its factorization.

21500032141225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52578465 (or 52578460 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21500032141225 its reverse (52214123000512), we get a palindrome (73714155141737).

The spelling of 21500032141225 in words is "twenty-one trillion, five hundred billion, thirty-two million, one hundred forty-one thousand, two hundred twenty-five".