219968421 has 4 divisors (see below), whose sum is σ = 293291232. Its totient is φ = 146645612.

The previous prime is 219968417. The next prime is 219968429. The reversal of 219968421 is 124869912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 219968421 - 2² = 219968417 is a prime.

It is a super-2 number, since 2×219968421² = 96772212474466482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219968429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36661401 + ... + 36661406.

It is an arithmetic number, because the mean of its divisors is an integer number (73322808).

Almost surely, 2^219968421 is an apocalyptic number.

It is an amenable number.

219968421 is a deficient number, since it is larger than the sum of its proper divisors (73322811).

219968421 is an equidigital number, since it uses as much as digits as its factorization.

219968421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73322810.

The product of its digits is 62208, while the sum is 42.

The square root of 219968421 is about 14831.3324081149. The cubic root of 219968421 is about 603.6521879876.

The spelling of 219968421 in words is "two hundred nineteen million, nine hundred sixty-eight thousand, four hundred twenty-one".