20312542321 has 4 divisors (see below), whose sum is σ = 20327337972. Its totient is φ = 20297746672.

The previous prime is 20312542279. The next prime is 20312542339. The reversal of 20312542321 is 12324521302.

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 16874010000 + 3438532321 = 129900^2 + 58639^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312542321 - 2¹³ = 20312534129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312545321) 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, 7395766 + ... + 7398511.

It is an arithmetic number, because the mean of its divisors is an integer number (5081834493).

Almost surely, 2^20312542321 is an apocalyptic number.

It is an amenable number.

20312542321 is a deficient number, since it is larger than the sum of its proper divisors (14795651).

20312542321 is a wasteful number, since it uses less digits than its factorization.

20312542321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14795650.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 20312542321 in words is "twenty billion, three hundred twelve million, five hundred forty-two thousand, three hundred twenty-one".