21551425432132 has 24 divisors (see below), whose sum is σ = 39015793335960. Its totient is φ = 10404061274880.

The previous prime is 21551425432003. The next prime is 21551425432133. The reversal of 21551425432132 is 23123452415512.

It can be written as a sum of positive squares in 4 ways, for example, as 2871343806016 + 18680081626116 = 1694504^2 + 4322046^2 .

It is not an unprimeable number, because it can be changed into a prime (21551425432133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17594088 + ... + 18779104.

It is an arithmetic number, because the mean of its divisors is an integer number (1625658055665).

Almost surely, 2^{21551425432132} is an apocalyptic number.

It is an amenable number.

21551425432132 is a deficient number, since it is larger than the sum of its proper divisors (17464367903828).

21551425432132 is a wasteful number, since it uses less digits than its factorization.

21551425432132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341831 (or 1341829 counting only the distinct ones).

The product of its digits is 288000, while the sum is 40.

Adding to 21551425432132 its reverse (23123452415512), we get a palindrome (44674877847644).

The spelling of 21551425432132 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred twenty-five million, four hundred thirty-two thousand, one hundred thirty-two".