20315242454321 has 4 divisors (see below), whose sum is σ = 20317999313700. Its totient is φ = 20312485594944.

The previous prime is 20315242454251. The next prime is 20315242454333. The reversal of 20315242454321 is 12345424251302.

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 19030193494321 + 1285048960000 = 4362361^2 + 1133600^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315242454321 - 2³⁴ = 20298062585137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315242454021) 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, 1378418636 + ... + 1378433373.

It is an arithmetic number, because the mean of its divisors is an integer number (5079499828425).

Almost surely, 2^{20315242454321} is an apocalyptic number.

It is an amenable number.

20315242454321 is a deficient number, since it is larger than the sum of its proper divisors (2756859379).

20315242454321 is an equidigital number, since it uses as much as digits as its factorization.

20315242454321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756859378.

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 20315242454321 in words is "twenty trillion, three hundred fifteen billion, two hundred forty-two million, four hundred fifty-four thousand, three hundred twenty-one".