20300321021 has 4 divisors (see below), whose sum is σ = 20795450844. Its totient is φ = 19805191200.

The previous prime is 20300321011. The next prime is 20300321051. The reversal of 20300321021 is 12012300302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12012300302 = 2 ⋅6006150151.

It can be written as a sum of positive squares in 2 ways, for example, as 5315868100 + 14984452921 = 72910^2 + 122411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20300321021 - 2²² = 20296126717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20300320987 and 20300321005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20300321011) 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, 247564850 + ... + 247564931.

It is an arithmetic number, because the mean of its divisors is an integer number (5198862711).

Almost surely, 2^20300321021 is an apocalyptic number.

It is an amenable number.

20300321021 is a deficient number, since it is larger than the sum of its proper divisors (495129823).

20300321021 is an equidigital number, since it uses as much as digits as its factorization.

20300321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495129822.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20300321021 its reverse (12012300302), we get a palindrome (32312621323).

The spelling of 20300321021 in words is "twenty billion, three hundred million, three hundred twenty-one thousand, twenty-one".