21033410221 has 8 divisors (see below), whose sum is σ = 21305669120. Its totient is φ = 20761301808.

The previous prime is 21033410213. The next prime is 21033410243. The reversal of 21033410221 is 12201433012.

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 21033410221 - 2³ = 21033410213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033410821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258715 + ... + 330151.

It is an arithmetic number, because the mean of its divisors is an integer number (2663208640).

Almost surely, 2^21033410221 is an apocalyptic number.

It is an amenable number.

21033410221 is a deficient number, since it is larger than the sum of its proper divisors (272258899).

21033410221 is an equidigital number, since it uses as much as digits as its factorization.

21033410221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75243.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21033410221 its reverse (12201433012), we get a palindrome (33234843233).

The spelling of 21033410221 in words is "twenty-one billion, thirty-three million, four hundred ten thousand, two hundred twenty-one".