1021201001 has 8 divisors (see below), whose sum is σ = 1040450184. Its totient is φ = 1002131200.

The previous prime is 1021200967. The next prime is 1021201003. The reversal of 1021201001 is 1001021201.

It can be written as a sum of positive squares in 4 ways, for example, as 462400 + 1020738601 = 680^2 + 31949^2 .

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 1021201001 - 2¹⁸ = 1020938857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021201001.

It is not an unprimeable number, because it can be changed into a prime (1021201003) 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 7 ways as a sum of consecutive naturals, for example, 33326 + ... + 56151.

It is an arithmetic number, because the mean of its divisors is an integer number (130056273).

Almost surely, 2^1021201001 is an apocalyptic number.

It is an amenable number.

1021201001 is a deficient number, since it is larger than the sum of its proper divisors (19249183).

1021201001 is a wasteful number, since it uses less digits than its factorization.

1021201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89691.

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

The square root of 1021201001 is about 31956.2357138634. The cubic root of 1021201001 is about 1007.0176378920.

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

The spelling of 1021201001 in words is "one billion, twenty-one million, two hundred one thousand, one".