21224151222 has 32 divisors (see below), whose sum is σ = 42641988192. Its totient is φ = 7042473984.

The previous prime is 21224151167. The next prime is 21224151241. The reversal of 21224151222 is 22215142212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21224151192 and 21224151201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2890668 + ... + 2898000.

It is an arithmetic number, because the mean of its divisors is an integer number (1332562131).

Almost surely, 2^21224151222 is an apocalyptic number.

21224151222 is an abundant number, since it is smaller than the sum of its proper divisors (21417836970).

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

21224151222 is a wasteful number, since it uses less digits than its factorization.

21224151222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472.

The product of its digits is 1280, while the sum is 24.

Adding to 21224151222 its reverse (22215142212), we get a palindrome (43439293434).

The spelling of 21224151222 in words is "twenty-one billion, two hundred twenty-four million, one hundred fifty-one thousand, two hundred twenty-two".