21326424215 has 8 divisors (see below), whose sum is σ = 25845092928. Its totient is φ = 16892216800.

The previous prime is 21326424209. The next prime is 21326424247. The reversal of 21326424215 is 51242462312.

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

It is not a de Polignac number, because 21326424215 - 2⁴ = 21326424199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21114767 + ... + 21115776.

It is an arithmetic number, because the mean of its divisors is an integer number (3230636616).

Almost surely, 2^21326424215 is an apocalyptic number.

21326424215 is a deficient number, since it is larger than the sum of its proper divisors (4518668713).

21326424215 is a wasteful number, since it uses less digits than its factorization.

21326424215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42230649.

The product of its digits is 23040, while the sum is 32.

Adding to 21326424215 its reverse (51242462312), we get a palindrome (72568886527).

The spelling of 21326424215 in words is "twenty-one billion, three hundred twenty-six million, four hundred twenty-four thousand, two hundred fifteen".