100211221112221 has 4 divisors (see below), whose sum is σ = 100211512405500. Its totient is φ = 100210929818944.

The previous prime is 100211221112159. The next prime is 100211221112267. The reversal of 100211221112221 is 122211122112001.

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 61092763586596 + 39118457525625 = 7816186^2 + 6254475^2 .

It is a cyclic number.

It is not a de Polignac number, because 100211221112221 - 2²³ = 100211212723613 is a prime.

It is a super-4 number, since 4×100211221112221⁴ (a number of 57 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100211221115221) 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, 145129996 + ... + 145818853.

It is an arithmetic number, because the mean of its divisors is an integer number (25052878101375).

Almost surely, 2^{100211221112221} is an apocalyptic number.

It is an amenable number.

100211221112221 is a deficient number, since it is larger than the sum of its proper divisors (291293279).

100211221112221 is an equidigital number, since it uses as much as digits as its factorization.

100211221112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291293278.

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

Adding to 100211221112221 its reverse (122211122112001), we get a palindrome (222422343224222).

The spelling of 100211221112221 in words is "one hundred trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".