16401524082021 has 12 divisors (see below), whose sum is σ = 25513481905548. Its totient is φ = 10093245588864.

The previous prime is 16401524082007. The next prime is 16401524082023. The reversal of 16401524082021 is 12028042510461.

16401524082021 is a `hidden beast` number, since 1 + 6 + 40 + 1 + 5 + 2 + 408 + 202 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6188706019521 + 10212818062500 = 2487711^2 + 3195750^2 .

It is not a de Polignac number, because 16401524082021 - 2¹⁷ = 16401523950949 is a prime.

It is a super-2 number, since 2×16401524082021² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16401524082023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70091983140 + ... + 70091983373.

It is an arithmetic number, because the mean of its divisors is an integer number (2126123492129).

Almost surely, 2^{16401524082021} is an apocalyptic number.

It is an amenable number.

16401524082021 is a deficient number, since it is larger than the sum of its proper divisors (9111957823527).

16401524082021 is a wasteful number, since it uses less digits than its factorization.

16401524082021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140183966532 (or 140183966529 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

Adding to 16401524082021 its reverse (12028042510461), we get a palindrome (28429566592482).

The spelling of 16401524082021 in words is "sixteen trillion, four hundred one billion, five hundred twenty-four million, eighty-two thousand, twenty-one".