13321221111 has 48 divisors (see below), whose sum is σ = 21625438848. Its totient is φ = 7830820800.

The previous prime is 13321221107. The next prime is 13321221149. The reversal of 13321221111 is 11112212331.

13321221111 is a `hidden beast` number, since 1 + 332 + 1 + 221 + 111 = 666.

It is not a de Polignac number, because 13321221111 - 2² = 13321221107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13321221211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1206960 + ... + 1217946.

It is an arithmetic number, because the mean of its divisors is an integer number (450529976).

Almost surely, 2^13321221111 is an apocalyptic number.

13321221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13321221111 is a deficient number, since it is larger than the sum of its proper divisors (8304217737).

13321221111 is a wasteful number, since it uses less digits than its factorization.

13321221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11372 (or 11369 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 13321221111 its reverse (11112212331), we get a palindrome (24433433442).

It can be divided in two parts, 13321 and 221111, that added together give a palindrome (234432).

The spelling of 13321221111 in words is "thirteen billion, three hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".