19018945939021 has 16 divisors (see below), whose sum is σ = 21762221509504. Its totient is φ = 16282242609984.

The previous prime is 19018945939009. The next prime is 19018945939051. The reversal of 19018945939021 is 12093954981091.

It is a cyclic number.

It is not a de Polignac number, because 19018945939021 - 2⁷ = 19018945938893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19018945939051) 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 15 ways as a sum of consecutive naturals, for example, 254727331 + ... + 254801983.

It is an arithmetic number, because the mean of its divisors is an integer number (1360138844344).

Almost surely, 2^{19018945939021} is an apocalyptic number.

It is an amenable number.

19018945939021 is a deficient number, since it is larger than the sum of its proper divisors (2743275570483).

19018945939021 is an equidigital number, since it uses as much as digits as its factorization.

19018945939021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118180.

The product of its (nonzero) digits is 6298560, while the sum is 61.

The spelling of 19018945939021 in words is "nineteen trillion, eighteen billion, nine hundred forty-five million, nine hundred thirty-nine thousand, twenty-one".