21204424213 has 8 divisors (see below), whose sum is σ = 25509081920. Its totient is φ = 17218630080.

The previous prime is 21204424193. The next prime is 21204424217. The reversal of 21204424213 is 31242440212.

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 21204424213 - 2²⁵ = 21170869781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204424217) 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, 79715748 + ... + 79716013.

It is an arithmetic number, because the mean of its divisors is an integer number (3188635240).

Almost surely, 2^21204424213 is an apocalyptic number.

It is an amenable number.

21204424213 is a deficient number, since it is larger than the sum of its proper divisors (4304657707).

21204424213 is a wasteful number, since it uses less digits than its factorization.

21204424213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159431787.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21204424213 its reverse (31242440212), we get a palindrome (52446864425).

The spelling of 21204424213 in words is "twenty-one billion, two hundred four million, four hundred twenty-four thousand, two hundred thirteen".