1001021010021 has 8 divisors (see below), whose sum is σ = 1482994088960. Its totient is φ = 667347339996.

The previous prime is 1001021009983. The next prime is 1001021010043. The reversal of 1001021010021 is 1200101201001.

It is a happy number.

It is not a de Polignac number, because 1001021010021 - 2¹⁹ = 1001020485733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001021009985 and 1001021010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001021010071) 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, 18537426085 + ... + 18537426138.

It is an arithmetic number, because the mean of its divisors is an integer number (185374261120).

Almost surely, 2^{1001021010021} is an apocalyptic number.

It is an amenable number.

1001021010021 is a deficient number, since it is larger than the sum of its proper divisors (481973078939).

1001021010021 is an equidigital number, since it uses as much as digits as its factorization.

1001021010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37074852232 (or 37074852226 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1001021010021 its reverse (1200101201001), we get a palindrome (2201122211022).

The spelling of 1001021010021 in words is "one trillion, one billion, twenty-one million, ten thousand, twenty-one".