21501550150145 has 8 divisors (see below), whose sum is σ = 27786618655656. Its totient is φ = 15878067803136.

The previous prime is 21501550150141. The next prime is 21501550150183. The reversal of 21501550150145 is 54105105510512.

It can be written as a sum of positive squares in 4 ways, for example, as 4231508185969 + 17270041964176 = 2057063^2 + 4155724^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21501550150145 - 2² = 21501550150141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21501550150141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165396539552 + ... + 165396539681.

It is an arithmetic number, because the mean of its divisors is an integer number (3473327331957).

Almost surely, 2^{21501550150145} is an apocalyptic number.

It is an amenable number.

21501550150145 is a deficient number, since it is larger than the sum of its proper divisors (6285068505511).

21501550150145 is a wasteful number, since it uses less digits than its factorization.

21501550150145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330793079251.

The product of its (nonzero) digits is 25000, while the sum is 35.

Adding to 21501550150145 its reverse (54105105510512), we get a palindrome (75606655660657).

The spelling of 21501550150145 in words is "twenty-one trillion, five hundred one billion, five hundred fifty million, one hundred fifty thousand, one hundred forty-five".