21225303233505 has 96 divisors (see below), whose sum is σ = 42907147545600. Its totient is φ = 9702375096960.

The previous prime is 21225303233501. The next prime is 21225303233507. The reversal of 21225303233505 is 50533230352212.

21225303233505 is a `hidden beast` number, since 2 + 12 + 2 + 5 + 303 + 2 + 335 + 0 + 5 = 666.

It is not a de Polignac number, because 21225303233505 - 2² = 21225303233501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21225303233505.

It is not an unprimeable number, because it can be changed into a prime (21225303233501) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 313806040 + ... + 313873670.

It is an arithmetic number, because the mean of its divisors is an integer number (446949453600).

Almost surely, 2^{21225303233505} is an apocalyptic number.

It is an amenable number.

21225303233505 is an abundant number, since it is smaller than the sum of its proper divisors (21681844312095).

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

21225303233505 is a wasteful number, since it uses less digits than its factorization.

21225303233505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87996 (or 87979 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 36.

Adding to 21225303233505 its reverse (50533230352212), we get a palindrome (71758533585717).

The spelling of 21225303233505 in words is "twenty-one trillion, two hundred twenty-five billion, three hundred three million, two hundred thirty-three thousand, five hundred five".