1221431430542 has 8 divisors (see below), whose sum is σ = 1832366091600. Its totient is φ = 610642733344.

The previous prime is 1221431430529. The next prime is 1221431430587. The reversal of 1221431430542 is 2450341341221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1221431430499 and 1221431430508.

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, 36470042 + ... + 36503517.

It is an arithmetic number, because the mean of its divisors is an integer number (229045761450).

Almost surely, 2^{1221431430542} is an apocalyptic number.

1221431430542 is a deficient number, since it is larger than the sum of its proper divisors (610934661058).

1221431430542 is an equidigital number, since it uses as much as digits as its factorization.

1221431430542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72981930.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 1221431430542 its reverse (2450341341221), we get a palindrome (3671772771763).

The spelling of 1221431430542 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, four hundred thirty thousand, five hundred forty-two".