1000000121221 has 8 divisors (see below), whose sum is σ = 1005940696824. Its totient is φ = 994076740800.

The previous prime is 1000000121203. The next prime is 1000000121227. The reversal of 1000000121221 is 1221210000001.

1000000121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 192672713025 + 807327408196 = 438945^2 + 898514^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1000000121221 - 2³⁷ = 862561167749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000000121198 and 1000000121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000000121227) 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, 4182130 + ... + 4414771.

It is an arithmetic number, because the mean of its divisors is an integer number (125742587103).

Almost surely, 2^{1000000121221} is an apocalyptic number.

It is an amenable number.

1000000121221 is a deficient number, since it is larger than the sum of its proper divisors (5940575603).

1000000121221 is an equidigital number, since it uses as much as digits as its factorization.

1000000121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8597591.

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

Adding to 1000000121221 its reverse (1221210000001), we get a palindrome (2221210121222).

The spelling of 1000000121221 in words is "one trillion, one hundred twenty-one thousand, two hundred twenty-one".