1221240331424 has 24 divisors (see below), whose sum is σ = 2409253928928. Its totient is φ = 609366317760.

The previous prime is 1221240331397. The next prime is 1221240331481. The reversal of 1221240331424 is 4241330421221.

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, 39166922 + ... + 39198089.

It is an arithmetic number, because the mean of its divisors is an integer number (100385580372).

Almost surely, 2^{1221240331424} is an apocalyptic number.

It is an amenable number.

1221240331424 is a deficient number, since it is larger than the sum of its proper divisors (1188013597504).

1221240331424 is an equidigital number, since it uses as much as digits as its factorization.

1221240331424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78365508 (or 78365500 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 1221240331424 its reverse (4241330421221), we get a palindrome (5462570752645).

The spelling of 1221240331424 in words is "one trillion, two hundred twenty-one billion, two hundred forty million, three hundred thirty-one thousand, four hundred twenty-four".