21012521034541 has 4 divisors (see below), whose sum is σ = 21926108905632. Its totient is φ = 20098933163452.

The previous prime is 21012521034493. The next prime is 21012521034553. The reversal of 21012521034541 is 14543012521012.

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 a cyclic number.

It is not a de Polignac number, because 21012521034541 - 2⁷ = 21012521034413 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012521034341) 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 3 ways as a sum of consecutive naturals, for example, 456793935511 + ... + 456793935556.

It is an arithmetic number, because the mean of its divisors is an integer number (5481527226408).

Almost surely, 2^{21012521034541} is an apocalyptic number.

It is an amenable number.

21012521034541 is a deficient number, since it is larger than the sum of its proper divisors (913587871091).

21012521034541 is an equidigital number, since it uses as much as digits as its factorization.

21012521034541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913587871090.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21012521034541 its reverse (14543012521012), we get a palindrome (35555533555553).

The spelling of 21012521034541 in words is "twenty-one trillion, twelve billion, five hundred twenty-one million, thirty-four thousand, five hundred forty-one".