21150072001 has 2 divisors, whose sum is σ = 21150072002. Its totient is φ = 21150072000.

The previous prime is 21150071993. The next prime is 21150072019. The reversal of 21150072001 is 10027005112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18954680976 + 2195391025 = 137676^2 + 46855^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150072001 - 2³ = 21150071993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21150072001.

It is not a weakly prime, because it can be changed into another prime (21150072061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575036000 + 10575036001.

It is an arithmetic number, because the mean of its divisors is an integer number (10575036001).

Almost surely, 2^21150072001 is an apocalyptic number.

It is an amenable number.

21150072001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150072001 is an equidigital number, since it uses as much as digits as its factorization.

21150072001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

Adding to 21150072001 its reverse (10027005112), we get a palindrome (31177077113).

The spelling of 21150072001 in words is "twenty-one billion, one hundred fifty million, seventy-two thousand, one".