21103333221 has 8 divisors (see below), whose sum is σ = 29361159360. Its totient is φ = 13457197952.

The previous prime is 21103333219. The next prime is 21103333249. The reversal of 21103333221 is 12233330112.

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 21103333221 - 2¹ = 21103333219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103333201) 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, 152922636 + ... + 152922773.

It is an arithmetic number, because the mean of its divisors is an integer number (3670144920).

Almost surely, 2^21103333221 is an apocalyptic number.

It is an amenable number.

21103333221 is a deficient number, since it is larger than the sum of its proper divisors (8257826139).

21103333221 is a wasteful number, since it uses less digits than its factorization.

21103333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305845435.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21103333221 its reverse (12233330112), we get a palindrome (33336663333).

The spelling of 21103333221 in words is "twenty-one billion, one hundred three million, three hundred thirty-three thousand, two hundred twenty-one".