21324432016525 has 48 divisors (see below), whose sum is σ = 29353194400320. Its totient is φ = 15238368921600.

The previous prime is 21324432016523. The next prime is 21324432016567. The reversal of 21324432016525 is 52561023442312.

It is not a de Polignac number, because 21324432016525 - 2¹ = 21324432016523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324432016523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 832227 + ... + 6583423.

It is an arithmetic number, because the mean of its divisors is an integer number (611524883340).

Almost surely, 2^{21324432016525} is an apocalyptic number.

21324432016525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21324432016525 is a deficient number, since it is larger than the sum of its proper divisors (8028762383795).

21324432016525 is a wasteful number, since it uses less digits than its factorization.

21324432016525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5751454 (or 5751449 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 21324432016525 its reverse (52561023442312), we get a palindrome (73885455458837).

The spelling of 21324432016525 in words is "twenty-one trillion, three hundred twenty-four billion, four hundred thirty-two million, sixteen thousand, five hundred twenty-five".