21001533223 has 8 divisors (see below), whose sum is σ = 22958599680. Its totient is φ = 19052439480.

The previous prime is 21001533209. The next prime is 21001533233. The reversal of 21001533223 is 32233510012.

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 21001533223 - 2⁵ = 21001533191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001533194 and 21001533203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001533233) 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, 1987665 + ... + 1998202.

It is an arithmetic number, because the mean of its divisors is an integer number (2869824960).

Almost surely, 2^21001533223 is an apocalyptic number.

21001533223 is a deficient number, since it is larger than the sum of its proper divisors (1957066457).

21001533223 is a wasteful number, since it uses less digits than its factorization.

21001533223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986357.

The product of its (nonzero) digits is 1080, while the sum is 22.

The spelling of 21001533223 in words is "twenty-one billion, one million, five hundred thirty-three thousand, two hundred twenty-three".