1000100120221 has 4 divisors (see below), whose sum is σ = 1000113393244. Its totient is φ = 1000086847200.

The previous prime is 1000100120177. The next prime is 1000100120251. The reversal of 1000100120221 is 1220210010001.

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 260216292996 + 739883827225 = 510114^2 + 860165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000100120221 - 2¹³ = 1000100112029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000100120198 and 1000100120207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000100120251) 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, 6522840 + ... + 6674401.

It is an arithmetic number, because the mean of its divisors is an integer number (250028348311).

Almost surely, 2^{1000100120221} is an apocalyptic number.

It is an amenable number.

1000100120221 is a deficient number, since it is larger than the sum of its proper divisors (13273023).

1000100120221 is an equidigital number, since it uses as much as digits as its factorization.

1000100120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13273022.

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

Adding to 1000100120221 its reverse (1220210010001), we get a palindrome (2220310130222).

The spelling of 1000100120221 in words is "one trillion, one hundred million, one hundred twenty thousand, two hundred twenty-one".