21024230434221 has 48 divisors (see below), whose sum is σ = 33781585818240. Its totient is φ = 11583026582400.

The previous prime is 21024230434213. The next prime is 21024230434243. The reversal of 21024230434221 is 12243403242012.

It is not a de Polignac number, because 21024230434221 - 2³ = 21024230434213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024230439221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 529321 + ... + 6506046.

It is an arithmetic number, because the mean of its divisors is an integer number (703783037880).

Almost surely, 2^{21024230434221} is an apocalyptic number.

21024230434221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21024230434221 is a deficient number, since it is larger than the sum of its proper divisors (12757355384019).

21024230434221 is a wasteful number, since it uses less digits than its factorization.

21024230434221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036114 (or 7036107 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21024230434221 its reverse (12243403242012), we get a palindrome (33267633676233).

The spelling of 21024230434221 in words is "twenty-one trillion, twenty-four billion, two hundred thirty million, four hundred thirty-four thousand, two hundred twenty-one".