111222221020021 has 16 divisors (see below), whose sum is σ = 121889473947648. Its totient is φ = 101031381792000.

The previous prime is 111222221020019. The next prime is 111222221020037. The reversal of 111222221020021 is 120020122222111.

It is not a de Polignac number, because 111222221020021 - 2¹ = 111222221020019 is a prime.

It is a super-3 number, since 3×111222221020021³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222221020321) 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, 282709405 + ... + 283102546.

It is an arithmetic number, because the mean of its divisors is an integer number (7618092121728).

Almost surely, 2^{111222221020021} is an apocalyptic number.

It is an amenable number.

111222221020021 is a deficient number, since it is larger than the sum of its proper divisors (10667252927627).

111222221020021 is a wasteful number, since it uses less digits than its factorization.

111222221020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565812372.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 111222221020021 its reverse (120020122222111), we get a palindrome (231242343242132).

The spelling of 111222221020021 in words is "one hundred eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, twenty thousand, twenty-one".