219861734450 has 12 divisors (see below), whose sum is σ = 408942826170. Its totient is φ = 87944693760.

The previous prime is 219861734447. The next prime is 219861734471. The reversal of 219861734450 is 54437168912.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 116299414729 + 103562319721 = 341027^2 + 321811^2 .

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 4397234689 = 219861734450 / (2 + 1 + 9 + 8 + 6 + 1 + 7 + 3 + 4 + 4 + 5 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2198617295 + ... + 2198617394.

It is a 1-persistent number, because it is pandigital, but 2⋅219861734450 = 439723468900 is not.

Almost surely, 2^219861734450 is an apocalyptic number.

219861734450 is a deficient number, since it is larger than the sum of its proper divisors (189081091720).

219861734450 is a wasteful number, since it uses less digits than its factorization.

219861734450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397234701 (or 4397234696 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 219861734450 in words is "two hundred nineteen billion, eight hundred sixty-one million, seven hundred thirty-four thousand, four hundred fifty".