1351264536421 has 4 divisors (see below), whose sum is σ = 1351276433100. Its totient is φ = 1351252639744.

The previous prime is 1351264536397. The next prime is 1351264536431. The reversal of 1351264536421 is 1246354621531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 280068516225 + 1071196020196 = 529215^2 + 1034986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351264536421 - 2²⁹ = 1350727665509 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 (1351264536431) 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, 5776306 + ... + 6005683.

It is an arithmetic number, because the mean of its divisors is an integer number (337819108275).

Almost surely, 2^{1351264536421} is an apocalyptic number.

It is an amenable number.

1351264536421 is a deficient number, since it is larger than the sum of its proper divisors (11896679).

1351264536421 is a wasteful number, since it uses less digits than its factorization.

1351264536421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11896678.

The product of its digits is 518400, while the sum is 43.

The spelling of 1351264536421 in words is "one trillion, three hundred fifty-one billion, two hundred sixty-four million, five hundred thirty-six thousand, four hundred twenty-one".