1211421224 has 128 divisors (see below), whose sum is σ = 2792724480. Its totient is φ = 487111680.

The previous prime is 1211421199. The next prime is 1211421227. The reversal of 1211421224 is 4221241121.

It is a super-3 number, since 3×1211421224³ (a number of 28 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1211421196 and 1211421205.

It is not an unprimeable number, because it can be changed into a prime (1211421227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39078089 + ... + 39078119.

It is an arithmetic number, because the mean of its divisors is an integer number (21818160).

Almost surely, 2^1211421224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211421224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396362240).

1211421224 is an abundant number, since it is smaller than the sum of its proper divisors (1581303256).

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

1211421224 is a wasteful number, since it uses less digits than its factorization.

1211421224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 86 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

The square root of 1211421224 is about 34805.4769253346. The cubic root of 1211421224 is about 1066.0192799942.

Adding to 1211421224 its reverse (4221241121), we get a palindrome (5432662345).

The spelling of 1211421224 in words is "one billion, two hundred eleven million, four hundred twenty-one thousand, two hundred twenty-four".