219891919122 has 18 divisors (see below), whose sum is σ = 476436802023. Its totient is φ = 73296643212.

The previous prime is 219891919069. The next prime is 219891919133. The reversal of 219891919122 is 221919198912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 109945959561 + 109945959561 = 331581^2 + 331581^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=331581.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1934223 + ... + 2044749.

Almost surely, 2^219891919122 is an apocalyptic number.

219891919122 is an abundant number, since it is smaller than the sum of its proper divisors (256544882901).

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

219891919122 is an frugal number, since it uses more digits than its factorization.

219891919122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221062 (or 110532 counting only the distinct ones).

The product of its digits is 419904, while the sum is 54.

The spelling of 219891919122 in words is "two hundred nineteen billion, eight hundred ninety-one million, nine hundred nineteen thousand, one hundred twenty-two".