1221244432042 has 16 divisors (see below), whose sum is σ = 1916472845952. Its totient is φ = 583053904480.

The previous prime is 1221244432033. The next prime is 1221244432061. The reversal of 1221244432042 is 2402344421221.

It is a junction number, because it is equal to n+sod(n) for n = 1221244431995 and 1221244432013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158434708 + ... + 158442415.

It is an arithmetic number, because the mean of its divisors is an integer number (119779552872).

Almost surely, 2^{1221244432042} is an apocalyptic number.

1221244432042 is a deficient number, since it is larger than the sum of its proper divisors (695228413910).

1221244432042 is a wasteful number, since it uses less digits than its factorization.

1221244432042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316877213.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 1221244432042 its reverse (2402344421221), we get a palindrome (3623588853263).

The spelling of 1221244432042 in words is "one trillion, two hundred twenty-one billion, two hundred forty-four million, four hundred thirty-two thousand, forty-two".