100000121221 has 16 divisors (see below), whose sum is σ = 134265898368. Its totient is φ = 71928158400.

The previous prime is 100000121219. The next prime is 100000121239. The reversal of 100000121221 is 122121000001.

It is not a de Polignac number, because 100000121221 - 2¹ = 100000121219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100000121198 and 100000121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000121281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49949110 + ... + 49951111.

It is an arithmetic number, because the mean of its divisors is an integer number (8391618648).

Almost surely, 2^100000121221 is an apocalyptic number.

100000121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100000121221 is a deficient number, since it is larger than the sum of its proper divisors (34265777147).

100000121221 is a wasteful number, since it uses less digits than its factorization.

100000121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99900252.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100000121221 its reverse (122121000001), we get a palindrome (222121121222).

The spelling of 100000121221 in words is "one hundred billion, one hundred twenty-one thousand, two hundred twenty-one".