1221220244 has 12 divisors (see below), whose sum is σ = 2172170868. Its totient is φ = 600600000.

The previous prime is 1221220229. The next prime is 1221220271. The reversal of 1221220244 is 4420221221.

It can be written as a sum of positive squares in 2 ways, for example, as 77968900 + 1143251344 = 8830^2 + 33812^2 .

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2502257 + ... + 2502744.

It is an arithmetic number, because the mean of its divisors is an integer number (181014239).

Almost surely, 2^1221220244 is an apocalyptic number.

It is an amenable number.

1221220244 is a deficient number, since it is larger than the sum of its proper divisors (950950624).

1221220244 is a wasteful number, since it uses less digits than its factorization.

1221220244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5005066 (or 5005064 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1221220244 is about 34945.9617695665. The cubic root of 1221220244 is about 1068.8858592538.

Adding to 1221220244 its reverse (4420221221), we get a palindrome (5641441465).

The spelling of 1221220244 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred forty-four".