21021222114221 has 4 divisors (see below), whose sum is σ = 24024253844832. Its totient is φ = 18018190383612.

The previous prime is 21021222114199. The next prime is 21021222114227. The reversal of 21021222114221 is 12241122212012.

It is a happy number.

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 21021222114221 - 2³⁴ = 21004042245037 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 (21021222114227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501515865295 + ... + 1501515865308.

It is an arithmetic number, because the mean of its divisors is an integer number (6006063461208).

Almost surely, 2^{21021222114221} is an apocalyptic number.

It is an amenable number.

21021222114221 is a deficient number, since it is larger than the sum of its proper divisors (3003031730611).

21021222114221 is an equidigital number, since it uses as much as digits as its factorization.

21021222114221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003031730610.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 21021222114221 its reverse (12241122212012), we get a palindrome (33262344326233).

The spelling of 21021222114221 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, one hundred fourteen thousand, two hundred twenty-one".