1100001001021 has 8 divisors (see below), whose sum is σ = 1184809703000. Its totient is φ = 1015219904832.

The previous prime is 1100001000953. The next prime is 1100001001061. The reversal of 1100001001021 is 1201001000011.

It can be written as a sum of positive squares in 4 ways, for example, as 85527002500 + 1014473998521 = 292450^2 + 1007211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1100001001021 - 2²⁷ = 1099866783293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100001000995 and 1100001001013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100001001061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6818646 + ... + 6978103.

It is an arithmetic number, because the mean of its divisors is an integer number (148101212875).

Almost surely, 2^{1100001001021} is an apocalyptic number.

It is an amenable number.

1100001001021 is a deficient number, since it is larger than the sum of its proper divisors (84808701979).

1100001001021 is a wasteful number, since it uses less digits than its factorization.

1100001001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13802895.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 1100001001021 its reverse (1201001000011), we get a palindrome (2301002001032).

The spelling of 1100001001021 in words is "one trillion, one hundred billion, one million, one thousand, twenty-one".