21020220222221 has 8 divisors (see below), whose sum is σ = 22931222399424. Its totient is φ = 19109230222720.

The previous prime is 21020220222217. The next prime is 21020220222227. The reversal of 21020220222221 is 12222202202012.

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

It is not a de Polignac number, because 21020220222221 - 2² = 21020220222217 is a prime.

It is a super-3 number, since 3×21020220222221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020220222193 and 21020220222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020220222227) 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, 772856 + ... + 6529758.

It is an arithmetic number, because the mean of its divisors is an integer number (2866402799928).

Almost surely, 2^{21020220222221} is an apocalyptic number.

It is an amenable number.

21020220222221 is a deficient number, since it is larger than the sum of its proper divisors (1911002177203).

21020220222221 is a wasteful number, since it uses less digits than its factorization.

21020220222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6088851.

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

Adding to 21020220222221 its reverse (12222202202012), we get a palindrome (33242422424233).

The spelling of 21020220222221 in words is "twenty-one trillion, twenty billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".