1221013224 has 64 divisors (see below), whose sum is σ = 3397334400. Its totient is φ = 406328832.

The previous prime is 1221013217. The next prime is 1221013229. The reversal of 1221013224 is 4223101221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221013197 and 1221013206.

It is not an unprimeable number, because it can be changed into a prime (1221013229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135384 + ... + 144120.

It is an arithmetic number, because the mean of its divisors is an integer number (53083350).

Almost surely, 2^1221013224 is an apocalyptic number.

It is an amenable number.

1221013224 is an abundant number, since it is smaller than the sum of its proper divisors (2176321176).

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

1221013224 is a wasteful number, since it uses less digits than its factorization.

1221013224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9399 (or 9389 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1221013224 is about 34942.9996422746. Note that the first 3 decimals coincide. The cubic root of 1221013224 is about 1068.8254570300.

Adding to 1221013224 its reverse (4223101221), we get a palindrome (5444114445).

The spelling of 1221013224 in words is "one billion, two hundred twenty-one million, thirteen thousand, two hundred twenty-four".