1221242311304 has 8 divisors (see below), whose sum is σ = 2289829333710. Its totient is φ = 610621155648.

The previous prime is 1221242311301. The next prime is 1221242311411. The reversal of 1221242311304 is 4031132421221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 951206188804 + 270036122500 = 975298^2 + 519650^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1221242311301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76327644449 + ... + 76327644464.

Almost surely, 2^{1221242311304} is an apocalyptic number.

It is an amenable number.

1221242311304 is a deficient number, since it is larger than the sum of its proper divisors (1068587022406).

1221242311304 is a wasteful number, since it uses less digits than its factorization.

1221242311304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152655288919 (or 152655288915 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 1221242311304 its reverse (4031132421221), we get a palindrome (5252374732525).

The spelling of 1221242311304 in words is "one trillion, two hundred twenty-one billion, two hundred forty-two million, three hundred eleven thousand, three hundred four".