11221012215 has 56 divisors (see below), whose sum is σ = 23072722848. Its totient is φ = 5129593920.

The previous prime is 11221012213. The next prime is 11221012219. The reversal of 11221012215 is 51221012211.

It is not a de Polignac number, because 11221012215 - 2¹ = 11221012213 is a prime.

It is a super-2 number, since 2×11221012215² (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 (11221012213) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 194376 + ... + 245405.

It is an arithmetic number, because the mean of its divisors is an integer number (412012908).

Almost surely, 2^11221012215 is an apocalyptic number.

11221012215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11221012215 is an abundant number, since it is smaller than the sum of its proper divisors (11851710633).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11221012215 is an frugal number, since it uses more digits than its factorization.

11221012215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439811 (or 439796 counting only the distinct ones).

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

Adding to 11221012215 its reverse (51221012211), we get a palindrome (62442024426).

The spelling of 11221012215 in words is "eleven billion, two hundred twenty-one million, twelve thousand, two hundred fifteen".