111221000220021 has 16 divisors (see below), whose sum is σ = 148317571942848. Its totient is φ = 74135881872000.

The previous prime is 111221000219983. The next prime is 111221000220059. The reversal of 111221000220021 is 120022000122111.

It is an interprime number because it is at equal distance from previous prime (111221000219983) and next prime (111221000220059).

It is not a de Polignac number, because 111221000220021 - 2⁶ = 111221000219957 is a prime.

It is a super-2 number, since 2×111221000220021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221000225021) 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, 579068415 + ... + 579260451.

It is an arithmetic number, because the mean of its divisors is an integer number (9269848246428).

Almost surely, 2^{111221000220021} is an apocalyptic number.

It is an amenable number.

111221000220021 is a deficient number, since it is larger than the sum of its proper divisors (37096571722827).

111221000220021 is a wasteful number, since it uses less digits than its factorization.

111221000220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220852.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111221000220021 its reverse (120022000122111), we get a palindrome (231243000342132).

The spelling of 111221000220021 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty thousand, twenty-one".