21033531541 has 8 divisors (see below), whose sum is σ = 22958279424. Its totient is φ = 19110885120.

The previous prime is 21033531517. The next prime is 21033531551. The reversal of 21033531541 is 14513533012.

It is a happy number.

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 21033531541 - 2¹⁹ = 21033007253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033531551) 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 7 ways as a sum of consecutive naturals, for example, 504396 + ... + 544501.

It is an arithmetic number, because the mean of its divisors is an integer number (2869784928).

Almost surely, 2^21033531541 is an apocalyptic number.

It is an amenable number.

21033531541 is a deficient number, since it is larger than the sum of its proper divisors (1924747883).

21033531541 is a wasteful number, since it uses less digits than its factorization.

21033531541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050731.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 21033531541 in words is "twenty-one billion, thirty-three million, five hundred thirty-one thousand, five hundred forty-one".