100001121221 has 8 divisors (see below), whose sum is σ = 100556024544. Its totient is φ = 99447741360.

The previous prime is 100001121191. The next prime is 100001121239. The reversal of 100001121221 is 122121100001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100001121221 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 (100001121721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249095 + ... + 511908.

It is an arithmetic number, because the mean of its divisors is an integer number (12569503068).

Almost surely, 2^100001121221 is an apocalyptic number.

It is an amenable number.

100001121221 is a deficient number, since it is larger than the sum of its proper divisors (554903323).

100001121221 is an equidigital number, since it uses as much as digits as its factorization.

100001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761731.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100001121221 its reverse (122121100001), we get a palindrome (222122221222).

The spelling of 100001121221 in words is "one hundred billion, one million, one hundred twenty-one thousand, two hundred twenty-one".