1001011021001 has 8 divisors (see below), whose sum is σ = 1066390943520. Its totient is φ = 936900611712.

The previous prime is 1001011020983. The next prime is 1001011021051. The reversal of 1001011021001 is 1001201101001.

It is a happy number.

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 1001011021001 - 2⁶ = 1001011020937 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 1001011021001.

It is not an unprimeable number, because it can be changed into a prime (1001011021051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317376680 + ... + 317379833.

It is an arithmetic number, because the mean of its divisors is an integer number (133298867940).

Almost surely, 2^{1001011021001} is an apocalyptic number.

It is an amenable number.

1001011021001 is a deficient number, since it is larger than the sum of its proper divisors (65379922519).

1001011021001 is an equidigital number, since it uses as much as digits as its factorization.

1001011021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634756615.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1001011021001 its reverse (1001201101001), we get a palindrome (2002212122002).

The spelling of 1001011021001 in words is "one trillion, one billion, eleven million, twenty-one thousand, one".