21540100212132 has 24 divisors (see below), whose sum is σ = 50757859908672. Its totient is φ = 7108943964000.

The previous prime is 21540100212101. The next prime is 21540100212133. The reversal of 21540100212132 is 23121200104512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21540100212133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8886178744 + ... + 8886181167.

It is an arithmetic number, because the mean of its divisors is an integer number (2114910829528).

Almost surely, 2^{21540100212132} is an apocalyptic number.

It is an amenable number.

21540100212132 is an abundant number, since it is smaller than the sum of its proper divisors (29217759696540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21540100212132 is a wasteful number, since it uses less digits than its factorization.

21540100212132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17772360019 (or 17772360017 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21540100212132 its reverse (23121200104512), we get a palindrome (44661300316644).

The spelling of 21540100212132 in words is "twenty-one trillion, five hundred forty billion, one hundred million, two hundred twelve thousand, one hundred thirty-two".