111222100000021 has 4 divisors (see below), whose sum is σ = 111230848703052. Its totient is φ = 111213351296992.

The previous prime is 111222099999973. The next prime is 111222100000027. The reversal of 111222100000021 is 120000001222111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63153378548100 + 48068721451921 = 7946910^2 + 6933161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111222100000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111222099999947 and 111222100000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222100000027) 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, 4374332446 + ... + 4374357871.

It is an arithmetic number, because the mean of its divisors is an integer number (27807712175763).

Almost surely, 2^{111222100000021} is an apocalyptic number.

It is an amenable number.

111222100000021 is a deficient number, since it is larger than the sum of its proper divisors (8748703031).

111222100000021 is an equidigital number, since it uses as much as digits as its factorization.

111222100000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8748703030.

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

Adding to 111222100000021 its reverse (120000001222111), we get a palindrome (231222101222132).

The spelling of 111222100000021 in words is "one hundred eleven trillion, two hundred twenty-two billion, one hundred million, twenty-one", and thus it is an aban number.