221021012101111 has 16 divisors (see below), whose sum is σ = 224921514553120. Its totient is φ = 217153826795520.

The previous prime is 221021012101093. The next prime is 221021012101157. The reversal of 221021012101111 is 111101210120122.

It is a cyclic number.

It is not a de Polignac number, because 221021012101111 - 2²⁵ = 221020978546679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021012101811) 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, 198142801 + ... + 199255141.

It is an arithmetic number, because the mean of its divisors is an integer number (14057594659570).

Almost surely, 2^{221021012101111} is an apocalyptic number.

221021012101111 is a deficient number, since it is larger than the sum of its proper divisors (3900502452009).

221021012101111 is a wasteful number, since it uses less digits than its factorization.

221021012101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127314.

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

Adding to 221021012101111 its reverse (111101210120122), we get a palindrome (332122222221233).

The spelling of 221021012101111 in words is "two hundred twenty-one trillion, twenty-one billion, twelve million, one hundred one thousand, one hundred eleven".