121002001 has 2 divisors, whose sum is σ = 121002002. Its totient is φ = 121002000.

The previous prime is 121001989. The next prime is 121002019. The reversal of 121002001 is 100200121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 331776 = 10985^2 + 576^2 .

It is a cyclic number.

It is not a de Polignac number, because 121002001 - 2¹⁷ = 120870929 is a prime.

It is not a weakly prime, because it can be changed into another prime (121002041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501000 + 60501001.

It is an arithmetic number, because the mean of its divisors is an integer number (60501001).

Almost surely, 2^121002001 is an apocalyptic number.

It is an amenable number.

121002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002001 is an equidigital number, since it uses as much as digits as its factorization.

121002001 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 121002001 is about 11000.0909541694. The cubic root of 121002001 is about 494.6114707894.

Adding to 121002001 its reverse (100200121), we get a palindrome (221202122).

The spelling of 121002001 in words is "one hundred twenty-one million, two thousand, one".