21222120120221 has 8 divisors (see below), whose sum is σ = 21705859161984. Its totient is φ = 20739722935680.

The previous prime is 21222120120133. The next prime is 21222120120251. The reversal of 21222120120221 is 12202102122212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222120120221 - 2¹⁴ = 21222120103837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222120120193 and 21222120120202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222120120251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335432315 + ... + 335495576.

It is an arithmetic number, because the mean of its divisors is an integer number (2713232395248).

Almost surely, 2^{21222120120221} is an apocalyptic number.

It is an amenable number.

21222120120221 is a deficient number, since it is larger than the sum of its proper divisors (483739041763).

21222120120221 is an equidigital number, since it uses as much as digits as its factorization.

21222120120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670928611.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222120120221 its reverse (12202102122212), we get a palindrome (33424222242433).

The spelling of 21222120120221 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred twenty thousand, two hundred twenty-one".