21524415001 has 2 divisors, whose sum is σ = 21524415002. Its totient is φ = 21524415000.

The previous prime is 21524414981. The next prime is 21524415023. The reversal of 21524415001 is 10051442512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19299877776 + 2224537225 = 138924^2 + 47165^2 .

It is a cyclic number.

It is not a de Polignac number, because 21524415001 - 2¹⁷ = 21524283929 is a prime.

It is a super-2 number, since 2×21524415001² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21524415901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762207500 + 10762207501.

It is an arithmetic number, because the mean of its divisors is an integer number (10762207501).

Almost surely, 2^21524415001 is an apocalyptic number.

It is an amenable number.

21524415001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21524415001 is an equidigital number, since it uses as much as digits as its factorization.

21524415001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21524415001 its reverse (10051442512), we get a palindrome (31575857513).

The spelling of 21524415001 in words is "twenty-one billion, five hundred twenty-four million, four hundred fifteen thousand, one".