221423130 has 72 divisors (see below), whose sum is σ = 611628732. Its totient is φ = 55566336.

The previous prime is 221423123. The next prime is 221423171. The reversal of 221423130 is 31324122.

221423130 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 208484721 + 12938409 = 14439^2 + 3597^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 21754 + ... + 30266.

Almost surely, 2^221423130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221423130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305814366).

221423130 is an abundant number, since it is smaller than the sum of its proper divisors (390205602).

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

221423130 is a wasteful number, since it uses less digits than its factorization.

221423130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8560 (or 8540 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221423130 is about 14880.2933438827. The cubic root of 221423130 is about 604.9799688289.

Adding to 221423130 its reverse (31324122), we get a palindrome (252747252).

The spelling of 221423130 in words is "two hundred twenty-one million, four hundred twenty-three thousand, one hundred thirty".