21041413421 has 4 divisors (see below), whose sum is σ = 24047329632. Its totient is φ = 18035497212.

The previous prime is 21041413399. The next prime is 21041413423. The reversal of 21041413421 is 12431414012.

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 21041413421 - 2²² = 21037219117 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 (21041413423) 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, 1502958095 + ... + 1502958108.

It is an arithmetic number, because the mean of its divisors is an integer number (6011832408).

Almost surely, 2^21041413421 is an apocalyptic number.

It is an amenable number.

21041413421 is a deficient number, since it is larger than the sum of its proper divisors (3005916211).

21041413421 is an equidigital number, since it uses as much as digits as its factorization.

21041413421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005916210.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21041413421 its reverse (12431414012), we get a palindrome (33472827433).

The spelling of 21041413421 in words is "twenty-one billion, forty-one million, four hundred thirteen thousand, four hundred twenty-one".