21321120003525 has 36 divisors (see below), whose sum is σ = 38191650949920. Its totient is φ = 11370324247200.

The previous prime is 21321120003503. The next prime is 21321120003539. The reversal of 21321120003525 is 52530002112312.

21321120003525 is a `hidden beast` number, since 2 + 13 + 2 + 1 + 120 + 0 + 0 + 3 + 525 = 666.

It is not a de Polignac number, because 21321120003525 - 2¹¹ = 21321120001477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1182811 + ... + 6636360.

Almost surely, 2^{21321120003525} is an apocalyptic number.

21321120003525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21321120003525 is a deficient number, since it is larger than the sum of its proper divisors (16870530946395).

21321120003525 is a wasteful number, since it uses less digits than its factorization.

21321120003525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7831306 (or 7831298 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21321120003525 its reverse (52530002112312), we get a palindrome (73851122115837).

The spelling of 21321120003525 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty million, three thousand, five hundred twenty-five".