221021211121111 has 8 divisors (see below), whose sum is σ = 225218139374880. Its totient is φ = 216825272375712.

The previous prime is 221021211121049. The next prime is 221021211121157. The reversal of 221021211121111 is 111121112120122.

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 221021211121111 - 2²⁹ = 221020674250199 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 (221021211121171) 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, 246926115 + ... + 247819588.

It is an arithmetic number, because the mean of its divisors is an integer number (28152267421860).

Almost surely, 2^{221021211121111} is an apocalyptic number.

221021211121111 is a deficient number, since it is larger than the sum of its proper divisors (4196928253769).

221021211121111 is an equidigital number, since it uses as much as digits as its factorization.

221021211121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494754185.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 221021211121111 its reverse (111121112120122), we get a palindrome (332142323241233).

The spelling of 221021211121111 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred eleven".