21525433223120 has 20 divisors (see below), whose sum is σ = 50046632243940. Its totient is φ = 8610173289216.

The previous prime is 21525433223113. The next prime is 21525433223141. The reversal of 21525433223120 is 2132233452512.

It can be written as a sum of positive squares in 2 ways, for example, as 15221296496704 + 6304136726416 = 3901448^2 + 2510804^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134533957565 + ... + 134533957724.

It is an arithmetic number, because the mean of its divisors is an integer number (2502331612197).

Almost surely, 2^{21525433223120} is an apocalyptic number.

21525433223120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525433223120 is an abundant number, since it is smaller than the sum of its proper divisors (28521199020820).

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

21525433223120 is a wasteful number, since it uses less digits than its factorization.

21525433223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269067915302 (or 269067915296 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21525433223120 its reverse (2132233452512), we get a palindrome (23657666675632).

The spelling of 21525433223120 in words is "twenty-one trillion, five hundred twenty-five billion, four hundred thirty-three million, two hundred twenty-three thousand, one hundred twenty".