21030012001 has 2 divisors, whose sum is σ = 21030012002. Its totient is φ = 21030012000.

The previous prime is 21030011923. The next prime is 21030012023. The reversal of 21030012001 is 10021003012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15070017600 + 5959994401 = 122760^2 + 77201^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030012001 - 2²¹ = 21027914849 is a prime.

It is a super-2 number, since 2×21030012001² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21030013001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515006000 + 10515006001.

It is an arithmetic number, because the mean of its divisors is an integer number (10515006001).

Almost surely, 2^21030012001 is an apocalyptic number.

It is an amenable number.

21030012001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030012001 is an equidigital number, since it uses as much as digits as its factorization.

21030012001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21030012001 its reverse (10021003012), we get a palindrome (31051015013).

The spelling of 21030012001 in words is "twenty-one billion, thirty million, twelve thousand, one".