21410321421 has 4 divisors (see below), whose sum is σ = 28547095232. Its totient is φ = 14273547612.

The previous prime is 21410321419. The next prime is 21410321447. The reversal of 21410321421 is 12412301412.

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 21410321421 - 2¹ = 21410321419 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 (21410321021) 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 3 ways as a sum of consecutive naturals, for example, 3568386901 + ... + 3568386906.

It is an arithmetic number, because the mean of its divisors is an integer number (7136773808).

Almost surely, 2^21410321421 is an apocalyptic number.

It is an amenable number.

21410321421 is a deficient number, since it is larger than the sum of its proper divisors (7136773811).

21410321421 is an equidigital number, since it uses as much as digits as its factorization.

21410321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136773810.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21410321421 its reverse (12412301412), we get a palindrome (33822622833).

The spelling of 21410321421 in words is "twenty-one billion, four hundred ten million, three hundred twenty-one thousand, four hundred twenty-one".