21002002999 has 8 divisors (see below), whose sum is σ = 21220875648. Its totient is φ = 20784239160.

The previous prime is 21002002993. The next prime is 21002003003. The reversal of 21002002999 is 99920020012.

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 21002002999 - 2¹⁹ = 21001478711 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 (21002002993) 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, 239097 + ... + 314914.

It is an arithmetic number, because the mean of its divisors is an integer number (2652609456).

Almost surely, 2^21002002999 is an apocalyptic number.

21002002999 is a deficient number, since it is larger than the sum of its proper divisors (218872649).

21002002999 is a wasteful number, since it uses less digits than its factorization.

21002002999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554405.

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 21002002999 in words is "twenty-one billion, two million, two thousand, nine hundred ninety-nine".