21220221222021 has 8 divisors (see below), whose sum is σ = 28481003318464. Its totient is φ = 14053126636800.

The previous prime is 21220221222017. The next prime is 21220221222047. The reversal of 21220221222021 is 12022212202212.

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

It is not a de Polignac number, because 21220221222021 - 2² = 21220221222017 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 (21220221222121) 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, 23421877276 + ... + 23421878181.

It is an arithmetic number, because the mean of its divisors is an integer number (3560125414808).

Almost surely, 2^{21220221222021} is an apocalyptic number.

It is an amenable number.

21220221222021 is a deficient number, since it is larger than the sum of its proper divisors (7260782096443).

21220221222021 is a wasteful number, since it uses less digits than its factorization.

21220221222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46843755611.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21220221222021 its reverse (12022212202212), we get a palindrome (33242433424233).

The spelling of 21220221222021 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty-one".