21203322321 has 8 divisors (see below), whose sum is σ = 28296966400. Its totient is φ = 14122613232.

The previous prime is 21203322313. The next prime is 21203322331. The reversal of 21203322321 is 12322330212.

It is a happy number.

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

It is not a de Polignac number, because 21203322321 - 2³ = 21203322313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203322331) 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, 3229921 + ... + 3236478.

It is an arithmetic number, because the mean of its divisors is an integer number (3537120800).

Almost surely, 2^21203322321 is an apocalyptic number.

It is an amenable number.

21203322321 is a deficient number, since it is larger than the sum of its proper divisors (7093644079).

21203322321 is a wasteful number, since it uses less digits than its factorization.

21203322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6467495.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21203322321 its reverse (12322330212), we get a palindrome (33525652533).

The spelling of 21203322321 in words is "twenty-one billion, two hundred three million, three hundred twenty-two thousand, three hundred twenty-one".