21531400546364 has 6 divisors (see below), whose sum is σ = 37679950956144. Its totient is φ = 10765700273180.

The previous prime is 21531400546363. The next prime is 21531400546379. The reversal of 21531400546364 is 46364500413512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531400546363) by changing a digit.

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 as a sum of consecutive naturals, namely, 2691425068292 + ... + 2691425068299.

It is an arithmetic number, because the mean of its divisors is an integer number (6279991826024).

Almost surely, 2^{21531400546364} is an apocalyptic number.

It is an amenable number.

21531400546364 is a deficient number, since it is larger than the sum of its proper divisors (16148550409780).

21531400546364 is a wasteful number, since it uses less digits than its factorization.

21531400546364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382850136595 (or 5382850136593 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

Adding to 21531400546364 its reverse (46364500413512), we get a palindrome (67895900959876).

The spelling of 21531400546364 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred million, five hundred forty-six thousand, three hundred sixty-four".