111212200000021 has 4 divisors (see below), whose sum is σ = 111271767329152. Its totient is φ = 111152632670892.

The previous prime is 111212199999973. The next prime is 111212200000039. The reversal of 111212200000021 is 120000002212111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111212200000021 - 2²³ = 111212191611413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212199999947 and 111212200000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212200007021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29783661765 + ... + 29783665498.

It is an arithmetic number, because the mean of its divisors is an integer number (27817941832288).

Almost surely, 2^{111212200000021} is an apocalyptic number.

It is an amenable number.

111212200000021 is a deficient number, since it is larger than the sum of its proper divisors (59567329131).

111212200000021 is an equidigital number, since it uses as much as digits as its factorization.

111212200000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59567329130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111212200000021 its reverse (120000002212111), we get a palindrome (231212202212132).

The spelling of 111212200000021 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred million, twenty-one", and thus it is an aban number.