1243102144021 has 4 divisors (see below), whose sum is σ = 1245110387200. Its totient is φ = 1241093900844.

The previous prime is 1243102144019. The next prime is 1243102144033. The reversal of 1243102144021 is 1204412013421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243102144021 - 2¹ = 1243102144019 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 (1243102144051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1004120661 + ... + 1004121898.

It is an arithmetic number, because the mean of its divisors is an integer number (311277596800).

Almost surely, 2^{1243102144021} is an apocalyptic number.

It is an amenable number.

1243102144021 is a deficient number, since it is larger than the sum of its proper divisors (2008243179).

1243102144021 is an equidigital number, since it uses as much as digits as its factorization.

1243102144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008243178.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 1243102144021 its reverse (1204412013421), we get a palindrome (2447514157442).

The spelling of 1243102144021 in words is "one trillion, two hundred forty-three billion, one hundred two million, one hundred forty-four thousand, twenty-one".