1221430240 has 24 divisors (see below), whose sum is σ = 2885629320. Its totient is φ = 488572032.

The previous prime is 1221430201. The next prime is 1221430289. The reversal of 1221430240 is 420341221.

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, 3816810 + ... + 3817129.

It is an arithmetic number, because the mean of its divisors is an integer number (120234555).

Almost surely, 2^1221430240 is an apocalyptic number.

1221430240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221430240 is an abundant number, since it is smaller than the sum of its proper divisors (1664199080).

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

1221430240 is an equidigital number, since it uses as much as digits as its factorization.

1221430240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7633954 (or 7633946 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1221430240 is about 34948.9662221932. The cubic root of 1221430240 is about 1068.9471228114.

Adding to 1221430240 its reverse (420341221), we get a palindrome (1641771461).

The spelling of 1221430240 in words is "one billion, two hundred twenty-one million, four hundred thirty thousand, two hundred forty".