1221300308 has 6 divisors (see below), whose sum is σ = 2137275546. Its totient is φ = 610650152.

The previous prime is 1221300307. The next prime is 1221300341. The reversal of 1221300308 is 8030031221.

It can be written as a sum of positive squares in only one way, i.e., 1217870404 + 3429904 = 34898^2 + 1852^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221300308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221300307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152662535 + ... + 152662542.

It is an arithmetic number, because the mean of its divisors is an integer number (356212591).

Almost surely, 2^1221300308 is an apocalyptic number.

It is an amenable number.

1221300308 is a deficient number, since it is larger than the sum of its proper divisors (915975238).

1221300308 is a wasteful number, since it uses less digits than its factorization.

1221300308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305325081 (or 305325079 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1221300308 is about 34947.1072908760. The cubic root of 1221300308 is about 1068.9092176960.

Adding to 1221300308 its reverse (8030031221), we get a palindrome (9251331529).

The spelling of 1221300308 in words is "one billion, two hundred twenty-one million, three hundred thousand, three hundred eight".