1001000002021 has 16 divisors (see below), whose sum is σ = 1039235702400. Its totient is φ = 963014868928.

The previous prime is 1001000001949. The next prime is 1001000002073. The reversal of 1001000002021 is 1202000001001.

It is a cyclic number.

It is not a de Polignac number, because 1001000002021 - 2¹⁹ = 1000999477733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001000001995 and 1001000002013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001000002091) 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, 22252170 + ... + 22297108.

It is an arithmetic number, because the mean of its divisors is an integer number (64952231400).

Almost surely, 2^{1001000002021} is an apocalyptic number.

It is an amenable number.

1001000002021 is a deficient number, since it is larger than the sum of its proper divisors (38235700379).

1001000002021 is a wasteful number, since it uses less digits than its factorization.

1001000002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47708.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1001000002021 its reverse (1202000001001), we get a palindrome (2203000003022).

The spelling of 1001000002021 in words is "one trillion, one billion, two thousand, twenty-one".