1001001021103 has 4 divisors (see below), whose sum is σ = 1004722214760. Its totient is φ = 997279827448.

The previous prime is 1001001021071. The next prime is 1001001021157. The reversal of 1001001021103 is 3011201001001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1001001021103 - 2⁵ = 1001001021071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001001021103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001001021703) 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, 1860596425 + ... + 1860596962.

It is an arithmetic number, because the mean of its divisors is an integer number (251180553690).

Almost surely, 2^{1001001021103} is an apocalyptic number.

1001001021103 is a deficient number, since it is larger than the sum of its proper divisors (3721193657).

1001001021103 is an equidigital number, since it uses as much as digits as its factorization.

1001001021103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721193656.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 1001001021103 its reverse (3011201001001), we get a palindrome (4012202022104).

The spelling of 1001001021103 in words is "one trillion, one billion, one million, twenty-one thousand, one hundred three".