519120021 has 16 divisors (see below), whose sum is σ = 798300800. Its totient is φ = 293917248.

The previous prime is 519120011. The next prime is 519120053. The reversal of 519120021 is 120021915.

It is not a de Polignac number, because 519120021 - 2¹⁰ = 519118997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 519120021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (519120011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111106 + ... + 115683.

It is an arithmetic number, because the mean of its divisors is an integer number (49893800).

Almost surely, 2^519120021 is an apocalyptic number.

It is an amenable number.

519120021 is a deficient number, since it is larger than the sum of its proper divisors (279180779).

519120021 is a wasteful number, since it uses less digits than its factorization.

519120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226908.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 519120021 is about 22784.2055161026. The cubic root of 519120021 is about 803.6912860838.

Adding to 519120021 its reverse (120021915), we get a palindrome (639141936).

The spelling of 519120021 in words is "five hundred nineteen million, one hundred twenty thousand, twenty-one".