111010020111221 has 64 divisors (see below), whose sum is σ = 147775395465216. Its totient is φ = 80730817689600.

The previous prime is 111010020111169. The next prime is 111010020111241. The reversal of 111010020111221 is 122111020010111.

It is a de Polignac number, because none of the positive numbers 2^k-111010020111221 is a prime.

It is a super-2 number, since 2×111010020111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111010020111196 and 111010020111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111010020111241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 93934361 + ... + 95108801.

It is an arithmetic number, because the mean of its divisors is an integer number (2308990554144).

Almost surely, 2^{111010020111221} is an apocalyptic number.

111010020111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111010020111221 is a deficient number, since it is larger than the sum of its proper divisors (36765375353995).

111010020111221 is a wasteful number, since it uses less digits than its factorization.

111010020111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175082.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111010020111221 its reverse (122111020010111), we get a palindrome (233121040121332).

The spelling of 111010020111221 in words is "one hundred eleven trillion, ten billion, twenty million, one hundred eleven thousand, two hundred twenty-one".