1002121 has 2 divisors, whose sum is σ = 1002122. Its totient is φ = 1002120.

The previous prime is 1002109. The next prime is 1002143. The reversal of 1002121 is 1212001.

1002121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 876096 + 126025 = 936^2 + 355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002121 is a prime.

It is an Ulam number.

1002121 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1002101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501060 + 501061.

It is an arithmetic number, because the mean of its divisors is an integer number (501061).

2^1002121 is an apocalyptic number.

It is an amenable number.

1002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002121 is an equidigital number, since it uses as much as digits as its factorization.

1002121 is an evil number, because the sum of its binary digits is even.

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

The square root of 1002121 is about 1001.0599382654. The cubic root of 1002121 is about 100.0706500739.

Adding to 1002121 its reverse (1212001), we get a palindrome (2214122).

The spelling of 1002121 in words is "one million, two thousand, one hundred twenty-one".