100011121021221 has 4 divisors (see below), whose sum is σ = 133348161361632. Its totient is φ = 66674080680812.

The previous prime is 100011121021193. The next prime is 100011121021243. The reversal of 100011121021221 is 122120121110001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100011121021221 - 2⁹ = 100011121020709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100011121021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100011121021291) 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, 16668520170201 + ... + 16668520170206.

It is an arithmetic number, because the mean of its divisors is an integer number (33337040340408).

Almost surely, 2^{100011121021221} is an apocalyptic number.

It is an amenable number.

100011121021221 is a deficient number, since it is larger than the sum of its proper divisors (33337040340411).

100011121021221 is an equidigital number, since it uses as much as digits as its factorization.

100011121021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33337040340410.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 100011121021221 its reverse (122120121110001), we get a palindrome (222131242131222).

The spelling of 100011121021221 in words is "one hundred trillion, eleven billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty-one".