21531353160145 has 16 divisors (see below), whose sum is σ = 26276774472000. Its totient is φ = 16932342627648.

The previous prime is 21531353160131. The next prime is 21531353160199. The reversal of 21531353160145 is 54106135313512.

It is a cyclic number.

It is not a de Polignac number, because 21531353160145 - 2⁷ = 21531353160017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21531353160098 and 21531353160107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4678366 + ... + 8059144.

It is an arithmetic number, because the mean of its divisors is an integer number (1642298404500).

Almost surely, 2^{21531353160145} is an apocalyptic number.

It is an amenable number.

21531353160145 is a deficient number, since it is larger than the sum of its proper divisors (4745421311855).

21531353160145 is a wasteful number, since it uses less digits than its factorization.

21531353160145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402432.

The product of its (nonzero) digits is 162000, while the sum is 40.

Adding to 21531353160145 its reverse (54106135313512), we get a palindrome (75637488473657).

The spelling of 21531353160145 in words is "twenty-one trillion, five hundred thirty-one billion, three hundred fifty-three million, one hundred sixty thousand, one hundred forty-five".