21302434321 has 8 divisors (see below), whose sum is σ = 24452890560. Its totient is φ = 18178790928.

The previous prime is 21302434249. The next prime is 21302434333. The reversal of 21302434321 is 12343420312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21302434321 - 2²¹ = 21300337169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21302431321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6701506 + ... + 6704683.

It is an arithmetic number, because the mean of its divisors is an integer number (3056611320).

Almost surely, 2^21302434321 is an apocalyptic number.

It is an amenable number.

21302434321 is a deficient number, since it is larger than the sum of its proper divisors (3150456239).

21302434321 is a wasteful number, since it uses less digits than its factorization.

21302434321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13406423.

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

Adding to 21302434321 its reverse (12343420312), we get a palindrome (33645854633).

The spelling of 21302434321 in words is "twenty-one billion, three hundred two million, four hundred thirty-four thousand, three hundred twenty-one".