20030023021 has 16 divisors (see below), whose sum is σ = 21033851760. Its totient is φ = 19047813120.

The previous prime is 20030023019. The next prime is 20030023043. The reversal of 20030023021 is 12032003002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5095960996 + 14934062025 = 71386^2 + 122205^2 .

It is a cyclic number.

It is not a de Polignac number, because 20030023021 - 2¹ = 20030023019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20030022992 and 20030023010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20030023061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1604821 + ... + 1617253.

It is an arithmetic number, because the mean of its divisors is an integer number (1314615735).

Almost surely, 2^20030023021 is an apocalyptic number.

It is an amenable number.

20030023021 is a deficient number, since it is larger than the sum of its proper divisors (1003828739).

20030023021 is a wasteful number, since it uses less digits than its factorization.

20030023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13296.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 20030023021 its reverse (12032003002), we get a palindrome (32062026023).

The spelling of 20030023021 in words is "twenty billion, thirty million, twenty-three thousand, twenty-one".