1351243245021 has 4 divisors (see below), whose sum is σ = 1801657660032. Its totient is φ = 900828830012.

The previous prime is 1351243245007. The next prime is 1351243245031. The reversal of 1351243245021 is 1205423421531.

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 1351243245021 - 2⁶ = 1351243244957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351243245031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225207207501 + ... + 225207207506.

It is an arithmetic number, because the mean of its divisors is an integer number (450414415008).

Almost surely, 2^{1351243245021} is an apocalyptic number.

It is an amenable number.

1351243245021 is a deficient number, since it is larger than the sum of its proper divisors (450414415011).

1351243245021 is an equidigital number, since it uses as much as digits as its factorization.

1351243245021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450414415010.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 1351243245021 its reverse (1205423421531), we get a palindrome (2556666666552).

The spelling of 1351243245021 in words is "one trillion, three hundred fifty-one billion, two hundred forty-three million, two hundred forty-five thousand, twenty-one".