101111222021221 has 4 divisors (see below), whose sum is σ = 101111371782444. Its totient is φ = 101111072260000.

The previous prime is 101111222021203. The next prime is 101111222021261. The reversal of 101111222021221 is 122120222111101.

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 78310358270596 + 22800863750625 = 8849314^2 + 4775025^2 .

It is a cyclic number.

It is not a de Polignac number, because 101111222021221 - 2²³ = 101111213632613 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 (101111222021261) 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, 73863280 + ... + 75219721.

It is an arithmetic number, because the mean of its divisors is an integer number (25277842945611).

Almost surely, 2^{101111222021221} is an apocalyptic number.

It is an amenable number.

101111222021221 is a deficient number, since it is larger than the sum of its proper divisors (149761223).

101111222021221 is an equidigital number, since it uses as much as digits as its factorization.

101111222021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149761222.

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

Adding to 101111222021221 its reverse (122120222111101), we get a palindrome (223231444132322).

The spelling of 101111222021221 in words is "one hundred one trillion, one hundred eleven billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".