1221431551024 has 10 divisors (see below), whose sum is σ = 2366523630140. Its totient is φ = 610715775504.

The previous prime is 1221431551003. The next prime is 1221431551037. The reversal of 1221431551024 is 4201551341221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38169735954 + ... + 38169735985.

It is an arithmetic number, because the mean of its divisors is an integer number (236652363014).

Almost surely, 2^{1221431551024} is an apocalyptic number.

It is an amenable number.

1221431551024 is a deficient number, since it is larger than the sum of its proper divisors (1145092079116).

1221431551024 is an equidigital number, since it uses as much as digits as its factorization.

1221431551024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76339471947 (or 76339471941 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 1221431551024 its reverse (4201551341221), we get a palindrome (5422982892245).

The spelling of 1221431551024 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, five hundred fifty-one thousand, twenty-four".