221111020100221 has 8 divisors (see below), whose sum is σ = 221512664465784. Its totient is φ = 220709667313920.

The previous prime is 221111020100153. The next prime is 221111020100281. The reversal of 221111020100221 is 122001020111122.

It can be written as a sum of positive squares in 4 ways, for example, as 39521515584996 + 181589504515225 = 6286614^2 + 13475515^2 .

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 221111020100221 - 2³¹ = 221108872616573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221111020100195 and 221111020100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111020100281) 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, 71376766 + ... + 74410111.

It is an arithmetic number, because the mean of its divisors is an integer number (27689083058223).

Almost surely, 2^{221111020100221} is an apocalyptic number.

It is an amenable number.

221111020100221 is a deficient number, since it is larger than the sum of its proper divisors (401644365563).

221111020100221 is a wasteful number, since it uses less digits than its factorization.

221111020100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145789631.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221111020100221 its reverse (122001020111122), we get a palindrome (343112040211343).

The spelling of 221111020100221 in words is "two hundred twenty-one trillion, one hundred eleven billion, twenty million, one hundred thousand, two hundred twenty-one".