21020222020221 has 24 divisors (see below), whose sum is σ = 30374104564440. Its totient is φ = 14008146262656.

The previous prime is 21020222020219. The next prime is 21020222020223. The reversal of 21020222020221 is 12202022202012.

21020222020221 is a `hidden beast` number, since 2 + 1 + 0 + 202 + 220 + 20 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (21020222020219) and next prime (21020222020223).

It can be written as a sum of positive squares in 4 ways, for example, as 5345986755321 + 15674235264900 = 2312139^2 + 3959070^2 .

It is not a de Polignac number, because 21020222020221 - 2¹ = 21020222020219 is a prime.

It is a super-3 number, since 3×21020222020221³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020222020194 and 21020222020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020222020223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 272113615 + ... + 272190851.

It is an arithmetic number, because the mean of its divisors is an integer number (1265587690185).

Almost surely, 2^{21020222020221} is an apocalyptic number.

It is an amenable number.

21020222020221 is a deficient number, since it is larger than the sum of its proper divisors (9353882544219).

21020222020221 is a wasteful number, since it uses less digits than its factorization.

21020222020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88365 (or 88362 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21020222020221 its reverse (12202022202012), we get a palindrome (33222244222233).

The spelling of 21020222020221 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, twenty thousand, two hundred twenty-one".