1001100101021 has 4 divisors (see below), whose sum is σ = 1002433124544. Its totient is φ = 999767077500.

The previous prime is 1001100101011. The next prime is 1001100101123. The reversal of 1001100101021 is 1201010011001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001100101021 - 2¹⁸ = 1001099838877 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 (1001100101011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666510635 + ... + 666512136.

It is an arithmetic number, because the mean of its divisors is an integer number (250608281136).

Almost surely, 2^{1001100101021} is an apocalyptic number.

It is an amenable number.

1001100101021 is a deficient number, since it is larger than the sum of its proper divisors (1333023523).

1001100101021 is an equidigital number, since it uses as much as digits as its factorization.

1001100101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333023522.

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

Adding to 1001100101021 its reverse (1201010011001), we get a palindrome (2202110112022).

The spelling of 1001100101021 in words is "one trillion, one billion, one hundred million, one hundred one thousand, twenty-one".