21002001193 has 8 divisors (see below), whose sum is σ = 21102336000. Its totient is φ = 20901811200.

The previous prime is 21002001157. The next prime is 21002001199. The reversal of 21002001193 is 39110020012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002001193 is a prime.

It is a super-2 number, since 2×21002001193² (a number of 21 digits) contains 22 as substring.

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 21002001193.

It is not an unprimeable number, because it can be changed into a prime (21002001199) 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, 260308 + ... + 331306.

It is an arithmetic number, because the mean of its divisors is an integer number (2637792000).

Almost surely, 2^21002001193 is an apocalyptic number.

It is an amenable number.

21002001193 is a deficient number, since it is larger than the sum of its proper divisors (100334807).

21002001193 is a wasteful number, since it uses less digits than its factorization.

21002001193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72407.

The product of its (nonzero) digits is 108, while the sum is 19.

The spelling of 21002001193 in words is "twenty-one billion, two million, one thousand, one hundred ninety-three".