20034023021 has 2 divisors, whose sum is σ = 20034023022. Its totient is φ = 20034023020.

The previous prime is 20034023003. The next prime is 20034023033. The reversal of 20034023021 is 12032043002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18352120900 + 1681902121 = 135470^2 + 41011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20034023021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20034023521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10017011510 + 10017011511.

It is an arithmetic number, because the mean of its divisors is an integer number (10017011511).

Almost surely, 2^20034023021 is an apocalyptic number.

It is an amenable number.

20034023021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20034023021 is an equidigital number, since it uses as much as digits as its factorization.

20034023021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20034023021 its reverse (12032043002), we get a palindrome (32066066023).

The spelling of 20034023021 in words is "twenty billion, thirty-four million, twenty-three thousand, twenty-one".