21221111303 has 8 divisors (see below), whose sum is σ = 24284574240. Its totient is φ = 18165617280.

The previous prime is 21221111291. The next prime is 21221111363. The reversal of 21221111303 is 30311112212.

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 21221111303 - 2¹² = 21221107207 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 (21221111363) 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, 1986518 + ... + 1997171.

It is an arithmetic number, because the mean of its divisors is an integer number (3035571780).

Almost surely, 2^21221111303 is an apocalyptic number.

21221111303 is a deficient number, since it is larger than the sum of its proper divisors (3063462937).

21221111303 is an equidigital number, since it uses as much as digits as its factorization.

21221111303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984457.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21221111303 its reverse (30311112212), we get a palindrome (51532223515).

Subtracting 21221111303 from its reverse (30311112212), we obtain a palindrome (9090000909).

The spelling of 21221111303 in words is "twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, three hundred three".