1221103232544 has 48 divisors (see below), whose sum is σ = 3451964910912. Its totient is φ = 375724071168.

The previous prime is 1221103232533. The next prime is 1221103232603. The reversal of 1221103232544 is 4452323011221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×1221103232544³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489222804 + ... + 489225299.

It is an arithmetic number, because the mean of its divisors is an integer number (71915935644).

Almost surely, 2^{1221103232544} is an apocalyptic number.

It is an amenable number.

1221103232544 is an abundant number, since it is smaller than the sum of its proper divisors (2230861678368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221103232544 is a wasteful number, since it uses less digits than its factorization.

1221103232544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978448129 (or 978448121 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 1221103232544 its reverse (4452323011221), we get a palindrome (5673426243765).

The spelling of 1221103232544 in words is "one trillion, two hundred twenty-one billion, one hundred three million, two hundred thirty-two thousand, five hundred forty-four".