21230224421 has 8 divisors (see below), whose sum is σ = 24513249600. Its totient is φ = 18009733248.

The previous prime is 21230224417. The next prime is 21230224429. The reversal of 21230224421 is 12442203212.

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 21230224421 - 2² = 21230224417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230224429) 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, 15632771 + ... + 15634128.

It is an arithmetic number, because the mean of its divisors is an integer number (3064156200).

Almost surely, 2^21230224421 is an apocalyptic number.

It is an amenable number.

21230224421 is a deficient number, since it is larger than the sum of its proper divisors (3283025179).

21230224421 is an equidigital number, since it uses as much as digits as its factorization.

21230224421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31267003.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21230224421 its reverse (12442203212), we get a palindrome (33672427633).

The spelling of 21230224421 in words is "twenty-one billion, two hundred thirty million, two hundred twenty-four thousand, four hundred twenty-one".