221022201221021 has 4 divisors (see below), whose sum is σ = 222429985942332. Its totient is φ = 219614416499712.

The previous prime is 221022201220981. The next prime is 221022201221027. The reversal of 221022201221021 is 120122102220122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48701709352921 + 172320491868100 = 6978661^2 + 13127090^2 .

It is a cyclic number.

It is not a de Polignac number, because 221022201221021 - 2²² = 221022197026717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221022201220984 and 221022201221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022201221027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703892360420 + ... + 703892360733.

It is an arithmetic number, because the mean of its divisors is an integer number (55607496485583).

Almost surely, 2^{221022201221021} is an apocalyptic number.

It is an amenable number.

221022201221021 is a deficient number, since it is larger than the sum of its proper divisors (1407784721311).

221022201221021 is a wasteful number, since it uses less digits than its factorization.

221022201221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407784721310.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221022201221021 its reverse (120122102220122), we get a palindrome (341144303441143).

The spelling of 221022201221021 in words is "two hundred twenty-one trillion, twenty-two billion, two hundred one million, two hundred twenty-one thousand, twenty-one".