21530400450526 has 12 divisors (see below), whose sum is σ = 35498470164696. Its totient is φ = 9786545659220.

The previous prime is 21530400450511. The next prime is 21530400450527. The reversal of 21530400450526 is 62505400403512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530400450527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44484298210 + ... + 44484298693.

It is an arithmetic number, because the mean of its divisors is an integer number (2958205847058).

Almost surely, 2^{21530400450526} is an apocalyptic number.

21530400450526 is a deficient number, since it is larger than the sum of its proper divisors (13968069714170).

21530400450526 is a wasteful number, since it uses less digits than its factorization.

21530400450526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88968596927 (or 88968596916 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 21530400450526 in words is "twenty-one trillion, five hundred thirty billion, four hundred million, four hundred fifty thousand, five hundred twenty-six".