21034042541 has 8 divisors (see below), whose sum is σ = 21058438968. Its totient is φ = 21009664000.

The previous prime is 21034042529. The next prime is 21034042571. The reversal of 21034042541 is 14524043012.

It can be written as a sum of positive squares in 4 ways, for example, as 7426820041 + 13607222500 = 86179^2 + 116650^2 .

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 21034042541 - 2¹⁰ = 21034041517 is a prime.

It is a super-3 number, since 3×21034042541³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21034042541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034042571) 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, 4453061 + ... + 4457781.

It is an arithmetic number, because the mean of its divisors is an integer number (2632304871).

Almost surely, 2^21034042541 is an apocalyptic number.

It is an amenable number.

21034042541 is a deficient number, since it is larger than the sum of its proper divisors (24396427).

21034042541 is a wasteful number, since it uses less digits than its factorization.

21034042541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8943.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21034042541 its reverse (14524043012), we get a palindrome (35558085553).

The spelling of 21034042541 in words is "twenty-one billion, thirty-four million, forty-two thousand, five hundred forty-one".