221021102111221 has 16 divisors (see below), whose sum is σ = 224852944896000. Its totient is φ = 217221428274048.

The previous prime is 221021102111177. The next prime is 221021102111263. The reversal of 221021102111221 is 122111201120122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221021102111221 - 2¹¹ = 221021102109173 is a prime.

It is a super-2 number, since 2×221021102111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021102111921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11399436 + ... + 23916298.

It is an arithmetic number, because the mean of its divisors is an integer number (14053309056000).

Almost surely, 2^{221021102111221} is an apocalyptic number.

It is an amenable number.

221021102111221 is a deficient number, since it is larger than the sum of its proper divisors (3831842784779).

221021102111221 is a wasteful number, since it uses less digits than its factorization.

221021102111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12518148.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221021102111221 its reverse (122111201120122), we get a palindrome (343132303231343).

The spelling of 221021102111221 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".