21331222100021 has 4 divisors (see below), whose sum is σ = 21331815279552. Its totient is φ = 21330628920492.

The previous prime is 21331222099997. The next prime is 21331222100033. The reversal of 21331222100021 is 12000122213312.

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 a de Polignac number, because none of the positive numbers 2^k-21331222100021 is a prime.

It is a super-3 number, since 3×21331222100021³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21331222099966 and 21331222100002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331222100821) 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, 296535821 + ... + 296607746.

It is an arithmetic number, because the mean of its divisors is an integer number (5332953819888).

Almost surely, 2^{21331222100021} is an apocalyptic number.

It is an amenable number.

21331222100021 is a deficient number, since it is larger than the sum of its proper divisors (593179531).

21331222100021 is an equidigital number, since it uses as much as digits as its factorization.

21331222100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593179530.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21331222100021 its reverse (12000122213312), we get a palindrome (33331344313333).

The spelling of 21331222100021 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred twenty-two million, one hundred thousand, twenty-one".