216125040321 has 16 divisors (see below), whose sum is σ = 321794224000. Its totient is φ = 143359319664.

The previous prime is 216125040293. The next prime is 216125040353. The reversal of 216125040321 is 123040521612.

216125040321 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 250 + 403 + 2 + 1 = 666.

It is not a de Polignac number, because 216125040321 - 2¹⁴ = 216125023937 is a prime.

It is a super-3 number, since 3×216125040321³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216125040121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20106766 + ... + 20117511.

It is an arithmetic number, because the mean of its divisors is an integer number (20112139000).

Almost surely, 2^216125040321 is an apocalyptic number.

It is an amenable number.

216125040321 is a deficient number, since it is larger than the sum of its proper divisors (105669183679).

216125040321 is a wasteful number, since it uses less digits than its factorization.

216125040321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40224485 (or 40224479 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 216125040321 its reverse (123040521612), we get a palindrome (339165561933).

The spelling of 216125040321 in words is "two hundred sixteen billion, one hundred twenty-five million, forty thousand, three hundred twenty-one".