21010012001999 has 8 divisors (see below), whose sum is σ = 21025163559840. Its totient is φ = 20994861319776.

The previous prime is 21010012001987. The next prime is 21010012002017. The reversal of 21010012001999 is 99910021001012.

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 21010012001999 - 2⁸ = 21010012001743 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 (21010012001959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52315937 + ... + 52716005.

It is an arithmetic number, because the mean of its divisors is an integer number (2628145444980).

Almost surely, 2^{21010012001999} is an apocalyptic number.

21010012001999 is a deficient number, since it is larger than the sum of its proper divisors (15151557841).

21010012001999 is a wasteful number, since it uses less digits than its factorization.

21010012001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437809.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 21010012001999 in words is "twenty-one trillion, ten billion, twelve million, one thousand, nine hundred ninety-nine".