219421830 has 32 divisors (see below), whose sum is σ = 544773600. Its totient is φ = 56494592.

The previous prime is 219421799. The next prime is 219421831. The reversal of 219421830 is 38124912.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219421831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125235 + ... + 126974.

It is an arithmetic number, because the mean of its divisors is an integer number (17024175).

Almost surely, 2^219421830 is an apocalyptic number.

219421830 is an abundant number, since it is smaller than the sum of its proper divisors (325351770).

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

219421830 is a wasteful number, since it uses less digits than its factorization.

219421830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252248.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 219421830 is about 14812.8940453917. The cubic root of 219421830 is about 603.1517759686.

The spelling of 219421830 in words is "two hundred nineteen million, four hundred twenty-one thousand, eight hundred thirty".