20303230021 has 4 divisors (see below), whose sum is σ = 20304965772. Its totient is φ = 20301494272.

The previous prime is 20303229917. The next prime is 20303230069. The reversal of 20303230021 is 12003230302.

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 18629520100 + 1673709921 = 136490^2 + 40911^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303230021 - 2¹⁹ = 20302705733 is a prime.

It is a super-2 number, since 2×20303230021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303229977 and 20303230004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303230081) 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, 850210 + ... + 873763.

It is an arithmetic number, because the mean of its divisors is an integer number (5076241443).

Almost surely, 2^20303230021 is an apocalyptic number.

It is an amenable number.

20303230021 is a deficient number, since it is larger than the sum of its proper divisors (1735751).

20303230021 is a wasteful number, since it uses less digits than its factorization.

20303230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735750.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 20303230021 its reverse (12003230302), we get a palindrome (32306460323).

The spelling of 20303230021 in words is "twenty billion, three hundred three million, two hundred thirty thousand, twenty-one".