21432540213511 has 8 divisors (see below), whose sum is σ = 24503229018144. Its totient is φ = 18364075745280.

The previous prime is 21432540213473. The next prime is 21432540213599. The reversal of 21432540213511 is 11531204523412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21432540213511 - 2⁹ = 21432540212999 is a prime.

It is a super-2 number, since 2×21432540213511² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432540213011) 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 in 7 ways as a sum of consecutive naturals, for example, 556063450 + ... + 556101991.

It is an arithmetic number, because the mean of its divisors is an integer number (3062903627268).

Almost surely, 2^{21432540213511} is an apocalyptic number.

21432540213511 is a deficient number, since it is larger than the sum of its proper divisors (3070688804633).

21432540213511 is a wasteful number, since it uses less digits than its factorization.

21432540213511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112168201.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21432540213511 its reverse (11531204523412), we get a palindrome (32963744736923).

The spelling of 21432540213511 in words is "twenty-one trillion, four hundred thirty-two billion, five hundred forty million, two hundred thirteen thousand, five hundred eleven".