111221220002021 has 32 divisors (see below), whose sum is σ = 119983405977600. Its totient is φ = 102757589625600.

The previous prime is 111221220001981. The next prime is 111221220002023. The reversal of 111221220002021 is 120200022122111.

It is a cyclic number.

It is not a de Polignac number, because 111221220002021 - 2²² = 111221215807717 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 (111221220002023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1557270050 + ... + 1557341468.

It is an arithmetic number, because the mean of its divisors is an integer number (3749481436800).

Almost surely, 2^{111221220002021} is an apocalyptic number.

It is an amenable number.

111221220002021 is a deficient number, since it is larger than the sum of its proper divisors (8762185975579).

111221220002021 is a wasteful number, since it uses less digits than its factorization.

111221220002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74409.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111221220002021 its reverse (120200022122111), we get a palindrome (231421242124132).

The spelling of 111221220002021 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, two thousand, twenty-one".