19867819122 has 18 divisors (see below), whose sum is σ = 43048237167. Its totient is φ = 6622407036.

The previous prime is 19867819117. The next prime is 19867819187. The reversal of 19867819122 is 22191876891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9933909561 + 9933909561 = 99669^2 + 99669^2 .

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=99669.

It is a super-3 number, since 3×19867819122³ (a number of 32 digits) contains 333 as substring.

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, 581403 + ... + 614625.

Almost surely, 2^19867819122 is an apocalyptic number.

19867819122 is an abundant number, since it is smaller than the sum of its proper divisors (23180418045).

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

19867819122 is an frugal number, since it uses more digits than its factorization.

19867819122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66454 (or 33228 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The spelling of 19867819122 in words is "nineteen billion, eight hundred sixty-seven million, eight hundred nineteen thousand, one hundred twenty-two".