214221784 has 64 divisors (see below), whose sum is σ = 469224000. Its totient is φ = 89800704.

The previous prime is 214221781. The next prime is 214221797. The reversal of 214221784 is 487122412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214221781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613642 + ... + 613990.

It is an arithmetic number, because the mean of its divisors is an integer number (7331625).

Almost surely, 2^214221784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 214221784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234612000).

214221784 is an abundant number, since it is smaller than the sum of its proper divisors (255002216).

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

214221784 is a wasteful number, since it uses less digits than its factorization.

214221784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 568 counting only the distinct ones).

The product of its digits is 7168, while the sum is 31.

The square root of 214221784 is about 14636.3172963693. The cubic root of 214221784 is about 598.3489646748.

The spelling of 214221784 in words is "two hundred fourteen million, two hundred twenty-one thousand, seven hundred eighty-four".