21030012023 has 2 divisors, whose sum is σ = 21030012024. Its totient is φ = 21030012022.

The previous prime is 21030012001. The next prime is 21030012103. The reversal of 21030012023 is 32021003012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030012023 - 2¹² = 21030007927 is a prime.

It is a super-2 number, since 2×21030012023² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21030011989 and 21030012007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030012323) 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 as a sum of consecutive naturals, namely, 10515006011 + 10515006012.

It is an arithmetic number, because the mean of its divisors is an integer number (10515006012).

Almost surely, 2^21030012023 is an apocalyptic number.

21030012023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030012023 is an equidigital number, since it uses as much as digits as its factorization.

21030012023 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21030012023 its reverse (32021003012), we get a palindrome (53051015035).

The spelling of 21030012023 in words is "twenty-one billion, thirty million, twelve thousand, twenty-three".