219868421 has 2 divisors, whose sum is σ = 219868422. Its totient is φ = 219868420.

The previous prime is 219868409. The next prime is 219868447. The reversal of 219868421 is 124868912.

219868421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116337796 + 103530625 = 10786^2 + 10175^2 .

It is a cyclic number.

It is not a de Polignac number, because 219868421 - 2⁶ = 219868357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219868471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109934210 + 109934211.

It is an arithmetic number, because the mean of its divisors is an integer number (109934211).

Almost surely, 2^219868421 is an apocalyptic number.

It is an amenable number.

219868421 is a deficient number, since it is larger than the sum of its proper divisors (1).

219868421 is an equidigital number, since it uses as much as digits as its factorization.

219868421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 219868421 is about 14827.9607836007. The cubic root of 219868421 is about 603.5606985390.

The spelling of 219868421 in words is "two hundred nineteen million, eight hundred sixty-eight thousand, four hundred twenty-one".