1002000121 has 4 divisors (see below), whose sum is σ = 1002398544. Its totient is φ = 1001601700.

The previous prime is 1002000101. The next prime is 1002000137. The reversal of 1002000121 is 1210002001.

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 1002000121 - 2⁵ = 1002000089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002000101) 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, 195415 + ... + 200476.

It is an arithmetic number, because the mean of its divisors is an integer number (250599636).

Almost surely, 2^1002000121 is an apocalyptic number.

It is an amenable number.

1002000121 is a deficient number, since it is larger than the sum of its proper divisors (398423).

1002000121 is an equidigital number, since it uses as much as digits as its factorization.

1002000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398422.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1002000121 is about 31654.3854939564. The cubic root of 1002000121 is about 1000.6662629950. Note that the first 3 decimals are identical.

Adding to 1002000121 its reverse (1210002001), we get a palindrome (2212002122).

The spelling of 1002000121 in words is "one billion, two million, one hundred twenty-one", and thus it is an aban number.