20315021201 has 4 divisors (see below), whose sum is σ = 20316227892. Its totient is φ = 20313814512.

The previous prime is 20315021059. The next prime is 20315021213. The reversal of 20315021201 is 10212051302.

It is a happy number.

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 11056732801 + 9258288400 = 105151^2 + 96220^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315021201 - 2³⁴ = 3135152017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20315021201.

It is not an unprimeable number, because it can be changed into a prime (20315021261) 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, 577730 + ... + 611883.

It is an arithmetic number, because the mean of its divisors is an integer number (5079056973).

Almost surely, 2^20315021201 is an apocalyptic number.

It is an amenable number.

20315021201 is a deficient number, since it is larger than the sum of its proper divisors (1206691).

20315021201 is a wasteful number, since it uses less digits than its factorization.

20315021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206690.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20315021201 its reverse (10212051302), we get a palindrome (30527072503).

The spelling of 20315021201 in words is "twenty billion, three hundred fifteen million, twenty-one thousand, two hundred one".