11500221611 has 4 divisors (see below), whose sum is σ = 11611874352. Its totient is φ = 11388568872.

The previous prime is 11500221587. The next prime is 11500221619. The reversal of 11500221611 is 11612200511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11612200511 = 51577 ⋅225143.

It is a cyclic number.

It is not a de Polignac number, because 11500221611 - 2¹⁸ = 11499959467 is a prime.

It is a super-2 number, since 2×11500221611² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11500221619) 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, 55826216 + ... + 55826421.

It is an arithmetic number, because the mean of its divisors is an integer number (2902968588).

Almost surely, 2^11500221611 is an apocalyptic number.

11500221611 is a deficient number, since it is larger than the sum of its proper divisors (111652741).

11500221611 is a wasteful number, since it uses less digits than its factorization.

11500221611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111652740.

The product of its (nonzero) digits is 120, while the sum is 20.

The spelling of 11500221611 in words is "eleven billion, five hundred million, two hundred twenty-one thousand, six hundred eleven".