216221424 has 40 divisors (see below), whose sum is σ = 559166592. Its totient is φ = 71997120.

The previous prime is 216221417. The next prime is 216221429. The reversal of 216221424 is 424122612.

It is a happy number.

216221424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a junction number, because it is equal to n+sod(n) for n = 216221394 and 216221403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216221429) 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, 59829 + ... + 63339.

Almost surely, 2^216221424 is an apocalyptic number.

216221424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216221424 is an abundant number, since it is smaller than the sum of its proper divisors (342945168).

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

216221424 is a wasteful number, since it uses less digits than its factorization.

216221424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805 (or 4799 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 216221424 is about 14704.4695246037. The cubic root of 216221424 is about 600.2049522052.

The spelling of 216221424 in words is "two hundred sixteen million, two hundred twenty-one thousand, four hundred twenty-four".