21032543541 has 4 divisors (see below), whose sum is σ = 28043391392. Its totient is φ = 14021695692.

The previous prime is 21032543527. The next prime is 21032543593. The reversal of 21032543541 is 14534523012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21032543541 - 2¹¹ = 21032541493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21032543499 and 21032543508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032543501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505423921 + ... + 3505423926.

It is an arithmetic number, because the mean of its divisors is an integer number (7010847848).

Almost surely, 2^21032543541 is an apocalyptic number.

It is an amenable number.

21032543541 is a deficient number, since it is larger than the sum of its proper divisors (7010847851).

21032543541 is an equidigital number, since it uses as much as digits as its factorization.

21032543541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010847850.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21032543541 in words is "twenty-one billion, thirty-two million, five hundred forty-three thousand, five hundred forty-one".