221211211111011 has 24 divisors (see below), whose sum is σ = 363730687047936. Its totient is φ = 128238383251440.

The previous prime is 221211211110943. The next prime is 221211211111067. The reversal of 221211211111011 is 110111112112122.

221211211111011 is a `hidden beast` number, since 221 + 211 + 2 + 111 + 110 + 11 = 666.

221211211111011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221211211111011 - 2³³ = 221202621176419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221211211111211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48575142895 + ... + 48575147448.

It is an arithmetic number, because the mean of its divisors is an integer number (15155445293664).

Almost surely, 2^{221211211111011} is an apocalyptic number.

221211211111011 is a deficient number, since it is larger than the sum of its proper divisors (142519475936925).

221211211111011 is a wasteful number, since it uses less digits than its factorization.

221211211111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97150290383 (or 97150290380 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 221211211111011 its reverse (110111112112122), we get a palindrome (331322323223133).

The spelling of 221211211111011 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred eleven million, one hundred eleven thousand, eleven".