111221121001021 has 16 divisors (see below), whose sum is σ = 117880658462448. Its totient is φ = 104574647808000.

The previous prime is 111221121001019. The next prime is 111221121001061. The reversal of 111221121001021 is 120100121122111.

It can be written as a sum of positive squares in 8 ways, for example, as 4811064975396 + 106410056025625 = 2193414^2 + 10315525^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221121001021 - 2¹ = 111221121001019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111221121000986 and 111221121001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221121001061) 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, 69041091 + ... + 70633663.

It is an arithmetic number, because the mean of its divisors is an integer number (7367541153903).

Almost surely, 2^{111221121001021} is an apocalyptic number.

It is an amenable number.

111221121001021 is a deficient number, since it is larger than the sum of its proper divisors (6659537461427).

111221121001021 is a wasteful number, since it uses less digits than its factorization.

111221121001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596672.

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

Adding to 111221121001021 its reverse (120100121122111), we get a palindrome (231321242123132).

The spelling of 111221121001021 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, one thousand, twenty-one".