221022021010021 has 16 divisors (see below), whose sum is σ = 275564182232448. Its totient is φ = 172222288977600.

The previous prime is 221022021010013. The next prime is 221022021010031. The reversal of 221022021010021 is 120010120220122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221022021010021 - 2³ = 221022021010013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221022021009977 and 221022021010004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022021010001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17166630 + ... + 27142903.

It is an arithmetic number, because the mean of its divisors is an integer number (17222761389528).

Almost surely, 2^{221022021010021} is an apocalyptic number.

It is an amenable number.

221022021010021 is a deficient number, since it is larger than the sum of its proper divisors (54542161222427).

221022021010021 is a wasteful number, since it uses less digits than its factorization.

221022021010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44374332.

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

Adding to 221022021010021 its reverse (120010120220122), we get a palindrome (341032141230143).

The spelling of 221022021010021 in words is "two hundred twenty-one trillion, twenty-two billion, twenty-one million, ten thousand, twenty-one".