2021011022221 has 8 divisors (see below), whose sum is σ = 2111401071000. Its totient is φ = 1932000974400.

The previous prime is 2021011022183. The next prime is 2021011022273. The reversal of 2021011022221 is 1222201101202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 726945517321 + 1294065504900 = 852611^2 + 1137570^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2021011022221 - 2²³ = 2021002633613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021011022195 and 2021011022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021011020221) 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, 344997246 + ... + 345003103.

It is an arithmetic number, because the mean of its divisors is an integer number (263925133875).

Almost surely, 2^{2021011022221} is an apocalyptic number.

It is an amenable number.

2021011022221 is a deficient number, since it is larger than the sum of its proper divisors (90390048779).

2021011022221 is a wasteful number, since it uses less digits than its factorization.

2021011022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690000479.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021011022221 its reverse (1222201101202), we get a palindrome (3243212123423).

The spelling of 2021011022221 in words is "two trillion, twenty-one billion, eleven million, twenty-two thousand, two hundred twenty-one".