1000001001021 has 16 divisors (see below), whose sum is σ = 1485494719488. Its totient is φ = 593166292400.

The previous prime is 1000001000941. The next prime is 1000001001023. The reversal of 1000001001021 is 1201001000001.

It is not a de Polignac number, because 1000001001021 - 2¹⁴ = 1000000984637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000001001023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322371435 + ... + 322374536.

It is an arithmetic number, because the mean of its divisors is an integer number (92843419968).

Almost surely, 2^{1000001001021} is an apocalyptic number.

1000001001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1000001001021 is a deficient number, since it is larger than the sum of its proper divisors (485493718467).

1000001001021 is a wasteful number, since it uses less digits than its factorization.

1000001001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644746032.

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

Adding to 1000001001021 its reverse (1201001000001), we get a palindrome (2201002001022).

The spelling of 1000001001021 in words is "one trillion, one million, one thousand, twenty-one".