100221112211221 has 4 divisors (see below), whose sum is σ = 100221627498700. Its totient is φ = 100220596923744.

The previous prime is 100221112211137. The next prime is 100221112211239. The reversal of 100221112211221 is 122112211122001.

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 93639393795025 + 6581718416196 = 9676745^2 + 2565486^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221112211221 - 2¹³ = 100221112203029 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 (100221112221221) 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, 257351886 + ... + 257741023.

It is an arithmetic number, because the mean of its divisors is an integer number (25055406874675).

Almost surely, 2^{100221112211221} is an apocalyptic number.

It is an amenable number.

100221112211221 is a deficient number, since it is larger than the sum of its proper divisors (515287479).

100221112211221 is an equidigital number, since it uses as much as digits as its factorization.

100221112211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515287478.

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

Adding to 100221112211221 its reverse (122112211122001), we get a palindrome (222333323333222).

The spelling of 100221112211221 in words is "one hundred trillion, two hundred twenty-one billion, one hundred twelve million, two hundred eleven thousand, two hundred twenty-one".