19912913050 has 12 divisors (see below), whose sum is σ = 37038018366. Its totient is φ = 7965165200.

The previous prime is 19912912951. The next prime is 19912913051. The reversal of 19912913050 is 5031921991.

It can be written as a sum of positive squares in 3 ways, for example, as 17433769369 + 2479143681 = 132037^2 + 49791^2 .

It is a super-2 number, since 2×19912913050² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19912912994 and 19912913012.

It is not an unprimeable number, because it can be changed into a prime (19912913051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199129081 + ... + 199129180.

Almost surely, 2^19912913050 is an apocalyptic number.

19912913050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19912913050 is a deficient number, since it is larger than the sum of its proper divisors (17125105316).

19912913050 is a wasteful number, since it uses less digits than its factorization.

19912913050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398258273 (or 398258268 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 40.

The spelling of 19912913050 in words is "nineteen billion, nine hundred twelve million, nine hundred thirteen thousand, fifty".