21220302223021 has 8 divisors (see below), whose sum is σ = 23171488704000. Its totient is φ = 19272793758240.

The previous prime is 21220302222953. The next prime is 21220302223051. The reversal of 21220302223021 is 12032220302212.

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

It is not a de Polignac number, because 21220302223021 - 2⁷ = 21220302222893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220302222983 and 21220302223001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220302223051) 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, 919491981 + ... + 919515058.

It is an arithmetic number, because the mean of its divisors is an integer number (2896436088000).

Almost surely, 2^{21220302223021} is an apocalyptic number.

It is an amenable number.

21220302223021 is a deficient number, since it is larger than the sum of its proper divisors (1951186480979).

21220302223021 is a wasteful number, since it uses less digits than its factorization.

21220302223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839008099.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21220302223021 its reverse (12032220302212), we get a palindrome (33252522525233).

The spelling of 21220302223021 in words is "twenty-one trillion, two hundred twenty billion, three hundred two million, two hundred twenty-three thousand, twenty-one".