111534501221 has 16 divisors (see below), whose sum is σ = 138741398208. Its totient is φ = 88089772800.

The previous prime is 111534501217. The next prime is 111534501241. The reversal of 111534501221 is 122105435111.

It is a cyclic number.

It is not a de Polignac number, because 111534501221 - 2² = 111534501217 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 (111534501241) 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, 22937615 + ... + 22942476.

It is an arithmetic number, because the mean of its divisors is an integer number (8671337388).

Almost surely, 2^111534501221 is an apocalyptic number.

111534501221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111534501221 is a deficient number, since it is larger than the sum of its proper divisors (27206896987).

111534501221 is a wasteful number, since it uses less digits than its factorization.

111534501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45880132.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 111534501221 its reverse (122105435111), we get a palindrome (233639936332).

The spelling of 111534501221 in words is "one hundred eleven billion, five hundred thirty-four million, five hundred one thousand, two hundred twenty-one".