1221230240 has 48 divisors (see below), whose sum is σ = 2939613768. Its totient is φ = 479271936.

The previous prime is 1221230221. The next prime is 1221230273. The reversal of 1221230240 is 420321221.

It can be written as a sum of positive squares in 4 ways, for example, as 983700496 + 237529744 = 31364^2 + 15412^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63527 + ... + 80486.

Almost surely, 2^1221230240 is an apocalyptic number.

1221230240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221230240 is an abundant number, since it is smaller than the sum of its proper divisors (1718383528).

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

1221230240 is a wasteful number, since it uses less digits than its factorization.

1221230240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144081 (or 144073 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1221230240 is about 34946.1047900907. The cubic root of 1221230240 is about 1068.8887756139. Note that the first 3 decimals are identical.

Adding to 1221230240 its reverse (420321221), we get a palindrome (1641551461).

The spelling of 1221230240 in words is "one billion, two hundred twenty-one million, two hundred thirty thousand, two hundred forty".