1001021001 has 8 divisors (see below), whose sum is σ = 1336668864. Its totient is φ = 666360240.

The previous prime is 1001020997. The next prime is 1001021057. The reversal of 1001021001 is 1001201001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1001021001 - 2² = 1001020997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001021401) 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, 244405 + ... + 248466.

It is an arithmetic number, because the mean of its divisors is an integer number (167083608).

Almost surely, 2^1001021001 is an apocalyptic number.

It is an amenable number.

1001021001 is a deficient number, since it is larger than the sum of its proper divisors (335647863).

1001021001 is an equidigital number, since it uses as much as digits as its factorization.

1001021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493551.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1001021001 is about 31638.9159264346. The cubic root of 1001021001 is about 1000.3402179053.

Adding to 1001021001 its reverse (1001201001), we get a palindrome (2002222002).

The spelling of 1001021001 in words is "one billion, one million, twenty-one thousand, one".