111211021220021 has 8 divisors (see below), whose sum is σ = 117575430391200. Its totient is φ = 104897731801680.

The previous prime is 111211021219993. The next prime is 111211021220023. The reversal of 111211021220021 is 120022120112111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111211021220021 - 2⁴² = 106812974708917 is a prime.

It is a super-2 number, since 2×111211021220021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211021220023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12779933735 + ... + 12779942436.

It is an arithmetic number, because the mean of its divisors is an integer number (14696928798900).

Almost surely, 2^{111211021220021} is an apocalyptic number.

It is an amenable number.

111211021220021 is a deficient number, since it is larger than the sum of its proper divisors (6364409171179).

111211021220021 is a wasteful number, since it uses less digits than its factorization.

111211021220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25559876419.

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

Adding to 111211021220021 its reverse (120022120112111), we get a palindrome (231233141332132).

The spelling of 111211021220021 in words is "one hundred eleven trillion, two hundred eleven billion, twenty-one million, two hundred twenty thousand, twenty-one".