1353621464521 has 4 divisors (see below), whose sum is σ = 1354020884100. Its totient is φ = 1353222044944.

The previous prime is 1353621464509. The next prime is 1353621464543. The reversal of 1353621464521 is 1254641263531.

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 1218683523600 + 134937940921 = 1103940^2 + 367339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1353621464521 - 2⁹ = 1353621464009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1353621464501) 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, 199704706 + ... + 199711483.

It is an arithmetic number, because the mean of its divisors is an integer number (338505221025).

Almost surely, 2^{1353621464521} is an apocalyptic number.

It is an amenable number.

1353621464521 is a deficient number, since it is larger than the sum of its proper divisors (399419579).

1353621464521 is an equidigital number, since it uses as much as digits as its factorization.

1353621464521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399419578.

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

The spelling of 1353621464521 in words is "one trillion, three hundred fifty-three billion, six hundred twenty-one million, four hundred sixty-four thousand, five hundred twenty-one".