16521011401 has 2 divisors, whose sum is σ = 16521011402. Its totient is φ = 16521011400.

The previous prime is 16521011393. The next prime is 16521011411. The reversal of 16521011401 is 10411012561.

It is a happy number.

16521011401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9833697225 + 6687314176 = 99165^2 + 81776^2 .

It is a cyclic number.

It is not a de Polignac number, because 16521011401 - 2³ = 16521011393 is a prime.

It is not a weakly prime, because it can be changed into another prime (16521011411) 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, 8260505700 + 8260505701.

It is an arithmetic number, because the mean of its divisors is an integer number (8260505701).

Almost surely, 2^16521011401 is an apocalyptic number.

It is an amenable number.

16521011401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16521011401 is an equidigital number, since it uses as much as digits as its factorization.

16521011401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 16521011401 its reverse (10411012561), we get a palindrome (26932023962).

The spelling of 16521011401 in words is "sixteen billion, five hundred twenty-one million, eleven thousand, four hundred one".