111120210122221 has 4 divisors (see below), whose sum is σ = 111141994132444. Its totient is φ = 111098426112000.

The previous prime is 111120210122219. The next prime is 111120210122231. The reversal of 111120210122221 is 122221012021111.

It is a happy number.

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 44424077889321 + 66696132232900 = 6665139^2 + 8166770^2 .

It is a cyclic number.

It is not a de Polignac number, because 111120210122221 - 2¹ = 111120210122219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120210122231) 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, 10891997460 + ... + 10892007661.

It is an arithmetic number, because the mean of its divisors is an integer number (27785498533111).

Almost surely, 2^{111120210122221} is an apocalyptic number.

It is an amenable number.

111120210122221 is a deficient number, since it is larger than the sum of its proper divisors (21784010223).

111120210122221 is an equidigital number, since it uses as much as digits as its factorization.

111120210122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21784010222.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111120210122221 its reverse (122221012021111), we get a palindrome (233341222143332).

The spelling of 111120210122221 in words is "one hundred eleven trillion, one hundred twenty billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".