11212221550 has 24 divisors (see below), whose sum is σ = 21248222616. Its totient is φ = 4400267040.

The previous prime is 11212221529. The next prime is 11212221551. The reversal of 11212221550 is 5512221211.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212221551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2112864 + ... + 2118163.

It is an arithmetic number, because the mean of its divisors is an integer number (885342609).

Almost surely, 2^11212221550 is an apocalyptic number.

11212221550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11212221550 is a deficient number, since it is larger than the sum of its proper divisors (10036001066).

11212221550 is a wasteful number, since it uses less digits than its factorization.

11212221550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231092 (or 4231087 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 11212221550 its reverse (5512221211), we get a palindrome (16724442761).

The spelling of 11212221550 in words is "eleven billion, two hundred twelve million, two hundred twenty-one thousand, five hundred fifty".