21230021333221 has 4 divisors (see below), whose sum is σ = 21230045630944. Its totient is φ = 21229997035500.

The previous prime is 21230021333201. The next prime is 21230021333233. The reversal of 21230021333221 is 12233312003212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21230021333221 - 2¹¹ = 21230021331173 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 (21230021333201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10787385 + ... + 12602686.

It is an arithmetic number, because the mean of its divisors is an integer number (5307511407736).

Almost surely, 2^{21230021333221} is an apocalyptic number.

It is an amenable number.

21230021333221 is a deficient number, since it is larger than the sum of its proper divisors (24297723).

21230021333221 is an equidigital number, since it uses as much as digits as its factorization.

21230021333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24297722.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21230021333221 its reverse (12233312003212), we get a palindrome (33463333336433).

The spelling of 21230021333221 in words is "twenty-one trillion, two hundred thirty billion, twenty-one million, three hundred thirty-three thousand, two hundred twenty-one".