1001001002021 has 8 divisors (see below), whose sum is σ = 1017411610464. Its totient is φ = 984633637680.

The previous prime is 1001001002003. The next prime is 1001001002039. The reversal of 1001001002021 is 1202001001001.

It is an interprime number because it is at equal distance from previous prime (1001001002003) and next prime (1001001002039).

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 1001001002021 - 2²² = 1000996807717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001001002821) 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, 10764350 + ... + 10856943.

It is an arithmetic number, because the mean of its divisors is an integer number (127176451308).

Almost surely, 2^{1001001002021} is an apocalyptic number.

It is an amenable number.

1001001002021 is a deficient number, since it is larger than the sum of its proper divisors (16410608443).

1001001002021 is an equidigital number, since it uses as much as digits as its factorization.

1001001002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21622051.

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

Adding to 1001001002021 its reverse (1202001001001), we get a palindrome (2203002003022).

The spelling of 1001001002021 in words is "one trillion, one billion, one million, two thousand, twenty-one".