13521207450451 has 4 divisors (see below), whose sum is σ = 13522992907312. Its totient is φ = 13519421993592.

The previous prime is 13521207450427. The next prime is 13521207450479. The reversal of 13521207450451 is 15405470212531.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13521207450451 - 2¹¹ = 13521207448403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13521207450251) 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, 892717071 + ... + 892732216.

It is an arithmetic number, because the mean of its divisors is an integer number (3380748226828).

Almost surely, 2^{13521207450451} is an apocalyptic number.

13521207450451 is a deficient number, since it is larger than the sum of its proper divisors (1785456861).

13521207450451 is an equidigital number, since it uses as much as digits as its factorization.

13521207450451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785456860.

The product of its (nonzero) digits is 168000, while the sum is 40.

Adding to 13521207450451 its reverse (15405470212531), we get a palindrome (28926677662982).

The spelling of 13521207450451 in words is "thirteen trillion, five hundred twenty-one billion, two hundred seven million, four hundred fifty thousand, four hundred fifty-one".