111221002121021 has 16 divisors (see below), whose sum is σ = 122562783383040. Its totient is φ = 100277298475200.

The previous prime is 111221002120999. The next prime is 111221002121123. The reversal of 111221002121021 is 120121200122111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221002121021 is a prime.

It is a super-2 number, since 2×111221002121021² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221002141021) 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, 95270996 + ... + 96431346.

It is an arithmetic number, because the mean of its divisors is an integer number (7660173961440).

Almost surely, 2^{111221002121021} is an apocalyptic number.

It is an amenable number.

111221002121021 is a deficient number, since it is larger than the sum of its proper divisors (11341781262019).

111221002121021 is a wasteful number, since it uses less digits than its factorization.

111221002121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331876.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111221002121021 its reverse (120121200122111), we get a palindrome (231342202243132).

The spelling of 111221002121021 in words is "one hundred eleven trillion, two hundred twenty-one billion, two million, one hundred twenty-one thousand, twenty-one".