21000100019 has 8 divisors (see below), whose sum is σ = 21486731760. Its totient is φ = 20518845696.

The previous prime is 21000100003. The next prime is 21000100031. The reversal of 21000100019 is 91000100012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000100019 - 2⁴ = 21000100003 is a prime.

It is a super-2 number, since 2×21000100019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000099976 and 21000100012.

It is not an unprimeable number, because it can be changed into a prime (21000106019) 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 7 ways as a sum of consecutive naturals, for example, 1336454 + ... + 1352075.

It is an arithmetic number, because the mean of its divisors is an integer number (2685841470).

Almost surely, 2^21000100019 is an apocalyptic number.

21000100019 is a deficient number, since it is larger than the sum of its proper divisors (486631741).

21000100019 is a wasteful number, since it uses less digits than its factorization.

21000100019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688709.

The product of its (nonzero) digits is 18, while the sum is 14.

The spelling of 21000100019 in words is "twenty-one billion, one hundred thousand, nineteen".