21222022202021 has 16 divisors (see below), whose sum is σ = 21758437614144. Its totient is φ = 20687567007744.

The previous prime is 21222022201979. The next prime is 21222022202047. The reversal of 21222022202021 is 12020222022212.

It is a cyclic number.

It is not a de Polignac number, because 21222022202021 - 2³⁰ = 21220948460197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222022201984 and 21222022202002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222022202071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170159141 + ... + 170283813.

It is an arithmetic number, because the mean of its divisors is an integer number (1359902350884).

Almost surely, 2^{21222022202021} is an apocalyptic number.

It is an amenable number.

21222022202021 is a deficient number, since it is larger than the sum of its proper divisors (536415412123).

21222022202021 is a wasteful number, since it uses less digits than its factorization.

21222022202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132500.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21222022202021 its reverse (12020222022212), we get a palindrome (33242244224233).

The spelling of 21222022202021 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-two million, two hundred two thousand, twenty-one".