216551442 has 16 divisors (see below), whose sum is σ = 433492992. Its totient is φ = 72118800.

The previous prime is 216551431. The next prime is 216551443. The reversal of 216551442 is 244155612.

216551442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216551443) 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, 8773 + ... + 22584.

It is an arithmetic number, because the mean of its divisors is an integer number (27093312).

Almost surely, 2^216551442 is an apocalyptic number.

216551442 is an abundant number, since it is smaller than the sum of its proper divisors (216941550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216551442 is a wasteful number, since it uses less digits than its factorization.

216551442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32513.

The product of its digits is 9600, while the sum is 30.

The square root of 216551442 is about 14715.6869360557. The cubic root of 216551442 is about 600.5101605485.

The spelling of 216551442 in words is "two hundred sixteen million, five hundred fifty-one thousand, four hundred forty-two".