221442930 has 64 divisors (see below), whose sum is σ = 600566400. Its totient is φ = 58046400.

The previous prime is 221442911. The next prime is 221442937. The reversal of 221442930 is 39244122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 221442894 and 221442903.

It is not an unprimeable number, because it can be changed into a prime (221442937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8980 + ... + 22880.

It is an arithmetic number, because the mean of its divisors is an integer number (9383850).

Almost surely, 2^221442930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221442930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300283200).

221442930 is an abundant number, since it is smaller than the sum of its proper divisors (379123470).

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

221442930 is a wasteful number, since it uses less digits than its factorization.

221442930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13976 (or 13970 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 221442930 is about 14880.9586384749. The cubic root of 221442930 is about 604.9980010407.

The spelling of 221442930 in words is "two hundred twenty-one million, four hundred forty-two thousand, nine hundred thirty".