1221543343104 has 88 divisors (see below), whose sum is σ = 3720981052608. Its totient is φ = 349012377600.

The previous prime is 1221543343091. The next prime is 1221543343123. The reversal of 1221543343104 is 4013433451221.

It is a congruent number.

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, 28381197 + ... + 28424204.

Almost surely, 2^{1221543343104} is an apocalyptic number.

1221543343104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1221543343104 is an abundant number, since it is smaller than the sum of its proper divisors (2499437709504).

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

1221543343104 is an equidigital number, since it uses as much as digits as its factorization.

1221543343104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56805431 (or 56805413 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 1221543343104 its reverse (4013433451221), we get a palindrome (5234976794325).

The spelling of 1221543343104 in words is "one trillion, two hundred twenty-one billion, five hundred forty-three million, three hundred forty-three thousand, one hundred four".