11221515 has 12 divisors (see below), whose sum is σ = 19450704. Its totient is φ = 5984784.

The previous prime is 11221501. The next prime is 11221523. The reversal of 11221515 is 51512211.

11221515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11221515 - 2⁶ = 11221451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124639 + ... + 124728.

It is an arithmetic number, because the mean of its divisors is an integer number (1620892).

Almost surely, 2^11221515 is an apocalyptic number.

11221515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11221515 is a deficient number, since it is larger than the sum of its proper divisors (8229189).

11221515 is a wasteful number, since it uses less digits than its factorization.

11221515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249378 (or 249375 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 11221515 is about 3349.8529818486. The cubic root of 11221515 is about 223.8809622094.

Adding to 11221515 its reverse (51512211), we get a palindrome (62733726).

The spelling of 11221515 in words is "eleven million, two hundred twenty-one thousand, five hundred fifteen".