101111011122221 has 4 divisors (see below), whose sum is σ = 101669635493244. Its totient is φ = 100552386751200.

The previous prime is 101111011122127. The next prime is 101111011122227. The reversal of 101111011122221 is 122221110111101.

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 576097698121 + 100534913424100 = 759011^2 + 10026710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101111011122221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101111011122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101111011122227) 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, 279312185240 + ... + 279312185601.

It is an arithmetic number, because the mean of its divisors is an integer number (25417408873311).

Almost surely, 2^{101111011122221} is an apocalyptic number.

It is an amenable number.

101111011122221 is a deficient number, since it is larger than the sum of its proper divisors (558624371023).

101111011122221 is an equidigital number, since it uses as much as digits as its factorization.

101111011122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558624371022.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 101111011122221 its reverse (122221110111101), we get a palindrome (223332121233322).

The spelling of 101111011122221 in words is "one hundred one trillion, one hundred eleven billion, eleven million, one hundred twenty-two thousand, two hundred twenty-one".