216891822 has 16 divisors (see below), whose sum is σ = 495752832. Its totient is φ = 61969080.

The previous prime is 216891811. The next prime is 216891823. The reversal of 216891822 is 228198612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216891823) 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, 2582004 + ... + 2582087.

It is an arithmetic number, because the mean of its divisors is an integer number (30984552).

Almost surely, 2^216891822 is an apocalyptic number.

216891822 is an abundant number, since it is smaller than the sum of its proper divisors (278861010).

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

216891822 is a wasteful number, since it uses less digits than its factorization.

216891822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5164103.

The product of its digits is 27648, while the sum is 39.

The square root of 216891822 is about 14727.2476043557. The cubic root of 216891822 is about 600.8246272417.

The spelling of 216891822 in words is "two hundred sixteen million, eight hundred ninety-one thousand, eight hundred twenty-two".