221121221211 has 24 divisors (see below), whose sum is σ = 348951276336. Its totient is φ = 133813693440.

The previous prime is 221121221207. The next prime is 221121221221. The reversal of 221121221211 is 112122121122.

221121221211 is a `hidden beast` number, since 2 + 211 + 21 + 221 + 211 = 666.

It is not a de Polignac number, because 221121221211 - 2² = 221121221207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121221221) 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, 1592770 + ... + 1726023.

It is an arithmetic number, because the mean of its divisors is an integer number (14539636514).

Almost surely, 2^221121221211 is an apocalyptic number.

221121221211 is a deficient number, since it is larger than the sum of its proper divisors (127830055125).

221121221211 is a wasteful number, since it uses less digits than its factorization.

221121221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319483 (or 3319480 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 221121221211 its reverse (112122121122), we get a palindrome (333243342333).

It can be divided in two parts, 22 and 1121221211, that multiplied together give a palindrome (24666866642).

The spelling of 221121221211 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred eleven".