216124131 has 4 divisors (see below), whose sum is σ = 288165512. Its totient is φ = 144082752.

The previous prime is 216124127. The next prime is 216124147. The reversal of 216124131 is 131421612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 216124131 - 2² = 216124127 is a prime.

It is a super-2 number, since 2×216124131² = 93419280001010322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216124098 and 216124107.

It is not an unprimeable number, because it can be changed into a prime (216124151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36020686 + ... + 36020691.

It is an arithmetic number, because the mean of its divisors is an integer number (72041378).

Almost surely, 2^216124131 is an apocalyptic number.

216124131 is a deficient number, since it is larger than the sum of its proper divisors (72041381).

216124131 is an equidigital number, since it uses as much as digits as its factorization.

216124131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72041380.

The product of its digits is 288, while the sum is 21.

The square root of 216124131 is about 14701.1608725298. The cubic root of 216124131 is about 600.1149141010.

Adding to 216124131 its reverse (131421612), we get a palindrome (347545743).

The spelling of 216124131 in words is "two hundred sixteen million, one hundred twenty-four thousand, one hundred thirty-one".