21006258001 has 2 divisors, whose sum is σ = 21006258002. Its totient is φ = 21006258000.

The previous prime is 21006257981. The next prime is 21006258071. The reversal of 21006258001 is 10085260012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18666117376 + 2340140625 = 136624^2 + 48375^2 .

It is a cyclic number.

It is not a de Polignac number, because 21006258001 - 2¹¹ = 21006255953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21006258071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10503129000 + 10503129001.

It is an arithmetic number, because the mean of its divisors is an integer number (10503129001).

Almost surely, 2^21006258001 is an apocalyptic number.

It is an amenable number.

21006258001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21006258001 is an equidigital number, since it uses as much as digits as its factorization.

21006258001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The spelling of 21006258001 in words is "twenty-one billion, six million, two hundred fifty-eight thousand, one".