21030223221 has 36 divisors (see below), whose sum is σ = 35350821792. Its totient is φ = 12012399504.

The previous prime is 21030223171. The next prime is 21030223261. The reversal of 21030223221 is 12232203012.

It is not a de Polignac number, because 21030223221 - 2⁶ = 21030223157 is a prime.

It is a super-2 number, since 2×21030223221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21030223194 and 21030223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030223261) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1272010 + ... + 1288436.

It is an arithmetic number, because the mean of its divisors is an integer number (981967272).

Almost surely, 2^21030223221 is an apocalyptic number.

21030223221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21030223221 is a deficient number, since it is larger than the sum of its proper divisors (14320598571).

21030223221 is a wasteful number, since it uses less digits than its factorization.

21030223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19350 (or 19340 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21030223221 its reverse (12232203012), we get a palindrome (33262426233).

The spelling of 21030223221 in words is "twenty-one billion, thirty million, two hundred twenty-three thousand, two hundred twenty-one".