11117221521 has 8 divisors (see below), whose sum is σ = 16940528064. Its totient is φ = 6352698000.

The previous prime is 11117221487. The next prime is 11117221559. The reversal of 11117221521 is 12512271111.

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

It is not a de Polignac number, because 11117221521 - 2²² = 11113027217 is a prime.

It is a super-2 number, since 2×11117221521² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11117221491 and 11117221500.

It is not an unprimeable number, because it can be changed into a prime (11117221561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264695730 + ... + 264695771.

It is an arithmetic number, because the mean of its divisors is an integer number (2117566008).

Almost surely, 2^11117221521 is an apocalyptic number.

It is an amenable number.

11117221521 is a deficient number, since it is larger than the sum of its proper divisors (5823306543).

11117221521 is an equidigital number, since it uses as much as digits as its factorization.

11117221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529391511.

The product of its digits is 280, while the sum is 24.

Adding to 11117221521 its reverse (12512271111), we get a palindrome (23629492632).

The spelling of 11117221521 in words is "eleven billion, one hundred seventeen million, two hundred twenty-one thousand, five hundred twenty-one".