219270421 has 8 divisors (see below), whose sum is σ = 226996920. Its totient is φ = 211555008.

The previous prime is 219270397. The next prime is 219270427. The reversal of 219270421 is 124072912.

It can be written as a sum of positive squares in 4 ways, for example, as 8614225 + 210656196 = 2935^2 + 14514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 219270421 - 2²³ = 210881813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 219270421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219270427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 72675 + ... + 75631.

It is an arithmetic number, because the mean of its divisors is an integer number (28374615).

Almost surely, 2^219270421 is an apocalyptic number.

It is an amenable number.

219270421 is a deficient number, since it is larger than the sum of its proper divisors (7726499).

219270421 is a wasteful number, since it uses less digits than its factorization.

219270421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5543.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 219270421 is about 14807.7824470783. The cubic root of 219270421 is about 603.0130118651.

The spelling of 219270421 in words is "two hundred nineteen million, two hundred seventy thousand, four hundred twenty-one".