21333452221 has 8 divisors (see below), whose sum is σ = 21681509120. Its totient is φ = 20987345808.

The previous prime is 21333452219. The next prime is 21333452281. The reversal of 21333452221 is 12225433312.

It is a happy number.

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 21333452221 - 2¹ = 21333452219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21333452221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333452281) 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, 465561 + ... + 509326.

It is an arithmetic number, because the mean of its divisors is an integer number (2710188640).

Almost surely, 2^21333452221 is an apocalyptic number.

It is an amenable number.

21333452221 is a deficient number, since it is larger than the sum of its proper divisors (348056899).

21333452221 is an equidigital number, since it uses as much as digits as its factorization.

21333452221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975243.

The product of its digits is 8640, while the sum is 28.

Adding to 21333452221 its reverse (12225433312), we get a palindrome (33558885533).

The spelling of 21333452221 in words is "twenty-one billion, three hundred thirty-three million, four hundred fifty-two thousand, two hundred twenty-one".