21216532126432 has 24 divisors (see below), whose sum is σ = 42160421907576. Its totient is φ = 10509123388032.

The previous prime is 21216532126373. The next prime is 21216532126451. The reversal of 21216532126432 is 23462123561212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3098205123 + ... + 3098211970.

It is an arithmetic number, because the mean of its divisors is an integer number (1756684246149).

Almost surely, 2^{21216532126432} is an apocalyptic number.

It is an amenable number.

21216532126432 is a deficient number, since it is larger than the sum of its proper divisors (20943889781144).

21216532126432 is a wasteful number, since it uses less digits than its factorization.

21216532126432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196417210 (or 6196417202 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

Adding to 21216532126432 its reverse (23462123561212), we get a palindrome (44678655687644).

The spelling of 21216532126432 in words is "twenty-one trillion, two hundred sixteen billion, five hundred thirty-two million, one hundred twenty-six thousand, four hundred thirty-two".