111221000102121 has 128 divisors (see below), whose sum is σ = 198855481982976. Its totient is φ = 53620016394240.

The previous prime is 111221000102119. The next prime is 111221000102131. The reversal of 111221000102121 is 121201000122111.

It is a happy number.

It is not a de Polignac number, because 111221000102121 - 2¹ = 111221000102119 is a prime.

It is a super-2 number, since 2×111221000102121² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111221000102121.

It is not an unprimeable number, because it can be changed into a prime (111221000102111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 89188776 + ... + 90427206.

It is an arithmetic number, because the mean of its divisors is an integer number (1553558452992).

Almost surely, 2^{111221000102121} is an apocalyptic number.

It is an amenable number.

111221000102121 is a deficient number, since it is larger than the sum of its proper divisors (87634481880855).

111221000102121 is a wasteful number, since it uses less digits than its factorization.

111221000102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239031.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111221000102121 its reverse (121201000122111), we get a palindrome (232422000224232).

The spelling of 111221000102121 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred two thousand, one hundred twenty-one".