1221044242144 has 12 divisors (see below), whose sum is σ = 2403930851784. Its totient is φ = 610522121056.

The previous prime is 1221044242129. The next prime is 1221044242153. The reversal of 1221044242144 is 4412424401221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19078816252 + ... + 19078816315.

It is an arithmetic number, because the mean of its divisors is an integer number (200327570982).

Almost surely, 2^{1221044242144} is an apocalyptic number.

It is an amenable number.

1221044242144 is a deficient number, since it is larger than the sum of its proper divisors (1182886609640).

1221044242144 is an equidigital number, since it uses as much as digits as its factorization.

1221044242144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38157632577 (or 38157632569 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 31.

Adding to 1221044242144 its reverse (4412424401221), we get a palindrome (5633468643365).

The spelling of 1221044242144 in words is "one trillion, two hundred twenty-one billion, forty-four million, two hundred forty-two thousand, one hundred forty-four".