100121000221 has 4 divisors (see below), whose sum is σ = 109222909344. Its totient is φ = 91019091100.

The previous prime is 100121000201. The next prime is 100121000237. The reversal of 100121000221 is 122000121001.

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 100121000221 - 2⁹ = 100120999709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121000198 and 100121000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121000201) 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, 4550954545 + ... + 4550954566.

It is an arithmetic number, because the mean of its divisors is an integer number (27305727336).

Almost surely, 2^100121000221 is an apocalyptic number.

100121000221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100121000221 is a deficient number, since it is larger than the sum of its proper divisors (9101909123).

100121000221 is an equidigital number, since it uses as much as digits as its factorization.

100121000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9101909122.

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

Adding to 100121000221 its reverse (122000121001), we get a palindrome (222121121222).

The spelling of 100121000221 in words is "one hundred billion, one hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.