21013220541 has 8 divisors (see below), whose sum is σ = 28020822624. Its totient is φ = 14007216080.

The previous prime is 21013220539. The next prime is 21013220581. The reversal of 21013220541 is 14502231012.

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 21013220541 - 2¹ = 21013220539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013220581) 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, 368370 + ... + 421571.

It is an arithmetic number, because the mean of its divisors is an integer number (3502602828).

Almost surely, 2^21013220541 is an apocalyptic number.

It is an amenable number.

21013220541 is a deficient number, since it is larger than the sum of its proper divisors (7007602083).

21013220541 is an equidigital number, since it uses as much as digits as its factorization.

21013220541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798811.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21013220541 its reverse (14502231012), we get a palindrome (35515451553).

The spelling of 21013220541 in words is "twenty-one billion, thirteen million, two hundred twenty thousand, five hundred forty-one".