1224011221 has 8 divisors (see below), whose sum is σ = 1241411864. Its totient is φ = 1206627840.

The previous prime is 1224011167. The next prime is 1224011273. The reversal of 1224011221 is 1221104221.

It can be written as a sum of positive squares in 4 ways, for example, as 286794225 + 937216996 = 16935^2 + 30614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1224011221 - 2⁹ = 1224010709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1224011195 and 1224011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224011291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218941 + ... + 224461.

It is an arithmetic number, because the mean of its divisors is an integer number (155176483).

Almost surely, 2^1224011221 is an apocalyptic number.

It is an amenable number.

1224011221 is a deficient number, since it is larger than the sum of its proper divisors (17400643).

1224011221 is an equidigital number, since it uses as much as digits as its factorization.

1224011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8631.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1224011221 is about 34985.8717341729. The cubic root of 1224011221 is about 1069.6995170455.

Adding to 1224011221 its reverse (1221104221), we get a palindrome (2445115442).

The spelling of 1224011221 in words is "one billion, two hundred twenty-four million, eleven thousand, two hundred twenty-one".