111002220021 has 96 divisors (see below), whose sum is σ = 190081520640. Its totient is φ = 56972697600.

The previous prime is 111002219987. The next prime is 111002220029. The reversal of 111002220021 is 120022200111.

It is not a de Polignac number, because 111002220021 - 2¹⁰ = 111002218997 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111002219979 and 111002220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111002220029) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 54438520 + ... + 54440558.

It is an arithmetic number, because the mean of its divisors is an integer number (1980015840).

Almost surely, 2^111002220021 is an apocalyptic number.

111002220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111002220021 is a deficient number, since it is larger than the sum of its proper divisors (79079300619).

111002220021 is a wasteful number, since it uses less digits than its factorization.

111002220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455 (or 2448 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 111002220021 its reverse (120022200111), we get a palindrome (231024420132).

The spelling of 111002220021 in words is "one hundred eleven billion, two million, two hundred twenty thousand, twenty-one".