21041341433421 has 4 divisors (see below), whose sum is σ = 28055121911232. Its totient is φ = 14027560955612.

The previous prime is 21041341433381. The next prime is 21041341433423. The reversal of 21041341433421 is 12433414314012.

It is a happy number.

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 21041341433421 - 2²⁹ = 21040804562509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041341433423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506890238901 + ... + 3506890238906.

It is an arithmetic number, because the mean of its divisors is an integer number (7013780477808).

Almost surely, 2^{21041341433421} is an apocalyptic number.

It is an amenable number.

21041341433421 is a deficient number, since it is larger than the sum of its proper divisors (7013780477811).

21041341433421 is an equidigital number, since it uses as much as digits as its factorization.

21041341433421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013780477810.

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 21041341433421 its reverse (12433414314012), we get a palindrome (33474755747433).

The spelling of 21041341433421 in words is "twenty-one trillion, forty-one billion, three hundred forty-one million, four hundred thirty-three thousand, four hundred twenty-one".