221416428 has 24 divisors (see below), whose sum is σ = 517950832. Its totient is φ = 73617984.

The previous prime is 221416427. The next prime is 221416451. The reversal of 221416428 is 824614122.

It is a junction number, because it is equal to n+sod(n) for n = 221416395 and 221416404.

It is not an unprimeable number, because it can be changed into a prime (221416427) 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, 18475 + ... + 28002.

Almost surely, 2^221416428 is an apocalyptic number.

It is an amenable number.

221416428 is an abundant number, since it is smaller than the sum of its proper divisors (296534404).

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

221416428 is a wasteful number, since it uses less digits than its factorization.

221416428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46881 (or 46879 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 221416428 is about 14880.0681450053. The cubic root of 221416428 is about 604.9738649549.

The spelling of 221416428 in words is "two hundred twenty-one million, four hundred sixteen thousand, four hundred twenty-eight".