21231033303 has 8 divisors (see below), whose sum is σ = 28666374400. Its totient is φ = 13974857208.

The previous prime is 21231033293. The next prime is 21231033319. The reversal of 21231033303 is 30333013212.

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

It is not a de Polignac number, because 21231033303 - 2¹⁶ = 21230967767 is a prime.

It is a super-2 number, since 2×21231033303² (a number of 21 digits) contains 22 as substring.

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 21231033303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231033503) 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, 44790973 + ... + 44791446.

It is an arithmetic number, because the mean of its divisors is an integer number (3583296800).

Almost surely, 2^21231033303 is an apocalyptic number.

21231033303 is a deficient number, since it is larger than the sum of its proper divisors (7435341097).

21231033303 is an equidigital number, since it uses as much as digits as its factorization.

21231033303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89582501.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21231033303 its reverse (30333013212), we get a palindrome (51564046515).

The spelling of 21231033303 in words is "twenty-one billion, two hundred thirty-one million, thirty-three thousand, three hundred three".