1243559553421 has 16 divisors (see below), whose sum is σ = 1250461150528. Its totient is φ = 1236680265600.

The previous prime is 1243559553413. The next prime is 1243559553437.

1243559553421 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1243559553421 - 2³ = 1243559553413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243559553451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350592970 + ... + 350596516.

It is an arithmetic number, because the mean of its divisors is an integer number (78153821908).

Almost surely, 2^{1243559553421} is an apocalyptic number.

It is an amenable number.

1243559553421 is a deficient number, since it is larger than the sum of its proper divisors (6901597107).

1243559553421 is a wasteful number, since it uses less digits than its factorization.

1243559553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6172.

The product of its digits is 3240000, while the sum is 49.

The spelling of 1243559553421 in words is "one trillion, two hundred forty-three billion, five hundred fifty-nine million, five hundred fifty-three thousand, four hundred twenty-one".