21434321541 has 4 divisors (see below), whose sum is σ = 28579095392. Its totient is φ = 14289547692.

The previous prime is 21434321521. The next prime is 21434321569. The reversal of 21434321541 is 14512343412.

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 21434321541 - 2⁵ = 21434321509 is a prime.

It is a super-2 number, since 2×21434321541² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21434321499 and 21434321508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434321501) 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 3 ways as a sum of consecutive naturals, for example, 3572386921 + ... + 3572386926.

It is an arithmetic number, because the mean of its divisors is an integer number (7144773848).

Almost surely, 2^21434321541 is an apocalyptic number.

It is an amenable number.

21434321541 is a deficient number, since it is larger than the sum of its proper divisors (7144773851).

21434321541 is an equidigital number, since it uses as much as digits as its factorization.

21434321541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144773850.

The product of its digits is 11520, while the sum is 30.

Adding to 21434321541 its reverse (14512343412), we get a palindrome (35946664953).

The spelling of 21434321541 in words is "twenty-one billion, four hundred thirty-four million, three hundred twenty-one thousand, five hundred forty-one".