216129441 has 16 divisors (see below), whose sum is σ = 314673408. Its totient is φ = 130861200.

The previous prime is 216129437. The next prime is 216129443. The reversal of 216129441 is 144921612.

It is not a de Polignac number, because 216129441 - 2² = 216129437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216129399 and 216129408.

It is not an unprimeable number, because it can be changed into a prime (216129443) 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, 40626 + ... + 45636.

It is an arithmetic number, because the mean of its divisors is an integer number (19667088).

Almost surely, 2^216129441 is an apocalyptic number.

It is an amenable number.

216129441 is a deficient number, since it is larger than the sum of its proper divisors (98543967).

216129441 is a wasteful number, since it uses less digits than its factorization.

216129441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332.

The product of its digits is 3456, while the sum is 30.

The square root of 216129441 is about 14701.3414694034. The cubic root of 216129441 is about 600.1198288446.

The spelling of 216129441 in words is "two hundred sixteen million, one hundred twenty-nine thousand, four hundred forty-one".