11153500021 has 4 divisors (see below), whose sum is σ = 11538103500. Its totient is φ = 10768896544.

The previous prime is 11153500019. The next prime is 11153500037. The reversal of 11153500021 is 12000535111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12000535111 = 21863 ⋅548897.

It can be written as a sum of positive squares in 2 ways, for example, as 8741315025 + 2412184996 = 93495^2 + 49114^2 .

It is a cyclic number.

It is not a de Polignac number, because 11153500021 - 2¹ = 11153500019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11153500091) 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, 192301696 + ... + 192301753.

It is an arithmetic number, because the mean of its divisors is an integer number (2884525875).

Almost surely, 2^11153500021 is an apocalyptic number.

It is an amenable number.

11153500021 is a deficient number, since it is larger than the sum of its proper divisors (384603479).

11153500021 is an equidigital number, since it uses as much as digits as its factorization.

11153500021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384603478.

The product of its (nonzero) digits is 150, while the sum is 19.

The spelling of 11153500021 in words is "eleven billion, one hundred fifty-three million, five hundred thousand, twenty-one".