11220121215 has 40 divisors (see below), whose sum is σ = 20260017360. Its totient is φ = 5940355968.

The previous prime is 11220121181. The next prime is 11220121219. The reversal of 11220121215 is 51212102211.

It is not a de Polignac number, because 11220121215 - 2⁶ = 11220121151 is a prime.

It is a super-2 number, since 2×11220121215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220121219) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 45625 + ... + 156594.

It is an arithmetic number, because the mean of its divisors is an integer number (506500434).

Almost surely, 2^11220121215 is an apocalyptic number.

11220121215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11220121215 is a deficient number, since it is larger than the sum of its proper divisors (9039896145).

11220121215 is a wasteful number, since it uses less digits than its factorization.

11220121215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202373 (or 202364 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 11220121215 its reverse (51212102211), we get a palindrome (62432223426).

The spelling of 11220121215 in words is "eleven billion, two hundred twenty million, one hundred twenty-one thousand, two hundred fifteen".