21331310022421 has 4 divisors (see below), whose sum is σ = 24378640025632. Its totient is φ = 18283980019212.

The previous prime is 21331310022403. The next prime is 21331310022433. The reversal of 21331310022421 is 12422001313312.

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 21331310022421 - 2¹¹ = 21331310020373 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 (21331310002421) 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, 1523665001595 + ... + 1523665001608.

It is an arithmetic number, because the mean of its divisors is an integer number (6094660006408).

Almost surely, 2^{21331310022421} is an apocalyptic number.

It is an amenable number.

21331310022421 is a deficient number, since it is larger than the sum of its proper divisors (3047330003211).

21331310022421 is an equidigital number, since it uses as much as digits as its factorization.

21331310022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047330003210.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21331310022421 its reverse (12422001313312), we get a palindrome (33753311335733).

The spelling of 21331310022421 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred ten million, twenty-two thousand, four hundred twenty-one".