21420323341 has 4 divisors (see below), whose sum is σ = 22547708800. Its totient is φ = 20292937884.

The previous prime is 21420323329. The next prime is 21420323347. The reversal of 21420323341 is 14332302412.

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 21420323341 - 2⁷ = 21420323213 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 (21420323347) 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, 563692701 + ... + 563692738.

It is an arithmetic number, because the mean of its divisors is an integer number (5636927200).

Almost surely, 2^21420323341 is an apocalyptic number.

It is an amenable number.

21420323341 is a deficient number, since it is larger than the sum of its proper divisors (1127385459).

21420323341 is a wasteful number, since it uses less digits than its factorization.

21420323341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127385458.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21420323341 its reverse (14332302412), we get a palindrome (35752625753).

The spelling of 21420323341 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-three thousand, three hundred forty-one".