216381212 has 12 divisors (see below), whose sum is σ = 379658496. Its totient is φ = 107907360.

The previous prime is 216381211. The next prime is 216381229. The reversal of 216381212 is 212183612.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216381211) 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, 69089 + ... + 72152.

It is an arithmetic number, because the mean of its divisors is an integer number (31638208).

Almost surely, 2^216381212 is an apocalyptic number.

It is an amenable number.

216381212 is a deficient number, since it is larger than the sum of its proper divisors (163277284).

216381212 is a wasteful number, since it uses less digits than its factorization.

216381212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141628 (or 141626 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 216381212 is about 14709.9018351585. The cubic root of 216381212 is about 600.3527666263.

The spelling of 216381212 in words is "two hundred sixteen million, three hundred eighty-one thousand, two hundred twelve".