11001010921 has 4 divisors (see below), whose sum is σ = 11049050500. Its totient is φ = 10952971344.

The previous prime is 11001010919. The next prime is 11001010949. The reversal of 11001010921 is 12901010011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12901010011 = 97607 ⋅132173.

It can be written as a sum of positive squares in 2 ways, for example, as 10592526400 + 408484521 = 102920^2 + 20211^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001010921 - 2¹ = 11001010919 is a prime.

It is a super-2 number, since 2×11001010921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001010895 and 11001010904.

It is not an unprimeable number, because it can be changed into a prime (11001010991) 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 3 ways as a sum of consecutive naturals, for example, 24019446 + ... + 24019903.

It is an arithmetic number, because the mean of its divisors is an integer number (2762262625).

Almost surely, 2^11001010921 is an apocalyptic number.

It is an amenable number.

11001010921 is a deficient number, since it is larger than the sum of its proper divisors (48039579).

11001010921 is an equidigital number, since it uses as much as digits as its factorization.

11001010921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48039578.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 11001010921 its reverse (12901010011), we get a palindrome (23902020932).

The spelling of 11001010921 in words is "eleven billion, one million, ten thousand, nine hundred twenty-one".