1001021201 has 4 divisors (see below), whose sum is σ = 1010932404. Its totient is φ = 991110000.

The previous prime is 1001021179. The next prime is 1001021233. The reversal of 1001021201 is 1021201001.

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 753777025 + 247244176 = 27455^2 + 15724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001021201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001021291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4955450 + ... + 4955651.

It is an arithmetic number, because the mean of its divisors is an integer number (252733101).

Almost surely, 2^1001021201 is an apocalyptic number.

It is an amenable number.

1001021201 is a deficient number, since it is larger than the sum of its proper divisors (9911203).

1001021201 is an equidigital number, since it uses as much as digits as its factorization.

1001021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9911202.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1001021201 is about 31638.9190870990. The cubic root of 1001021201 is about 1000.3402845266.

Adding to 1001021201 its reverse (1021201001), we get a palindrome (2022222202).

The spelling of 1001021201 in words is "one billion, one million, twenty-one thousand, two hundred one".