19385121007 has 16 divisors (see below), whose sum is σ = 22550987520. Its totient is φ = 16318922688.

The previous prime is 19385120987. The next prime is 19385121031. The reversal of 19385121007 is 70012158391.

It is a cyclic number.

It is not a de Polignac number, because 19385121007 - 2¹¹ = 19385118959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19385121037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431668 + ... + 474454.

It is an arithmetic number, because the mean of its divisors is an integer number (1409436720).

Almost surely, 2^19385121007 is an apocalyptic number.

19385121007 is a deficient number, since it is larger than the sum of its proper divisors (3165866513).

19385121007 is a wasteful number, since it uses less digits than its factorization.

19385121007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43950.

The product of its (nonzero) digits is 15120, while the sum is 37.

Adding to 19385121007 its reverse (70012158391), we get a palindrome (89397279398).

The spelling of 19385121007 in words is "nineteen billion, three hundred eighty-five million, one hundred twenty-one thousand, seven".