21334130421 has 4 divisors (see below), whose sum is σ = 28445507232. Its totient is φ = 14222753612.

The previous prime is 21334130407. The next prime is 21334130437. The reversal of 21334130421 is 12403143312.

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 21334130421 - 2¹¹ = 21334128373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21334130391 and 21334130400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334150421) 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, 3555688401 + ... + 3555688406.

It is an arithmetic number, because the mean of its divisors is an integer number (7111376808).

Almost surely, 2^21334130421 is an apocalyptic number.

It is an amenable number.

21334130421 is a deficient number, since it is larger than the sum of its proper divisors (7111376811).

21334130421 is an equidigital number, since it uses as much as digits as its factorization.

21334130421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111376810.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21334130421 its reverse (12403143312), we get a palindrome (33737273733).

The spelling of 21334130421 in words is "twenty-one billion, three hundred thirty-four million, one hundred thirty thousand, four hundred twenty-one".