21003001199999 has 48 divisors (see below), whose sum is σ = 26752033078848. Its totient is φ = 16341680130048.

The previous prime is 21003001199993. The next prime is 21003001200011. The reversal of 21003001199999 is 99999110030012.

It is not a de Polignac number, because 21003001199999 - 2²⁸ = 21002732764543 is a prime.

It is a super-2 number, since 2×21003001199999² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003001199999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003001199993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8618342 + ... + 10783404.

It is an arithmetic number, because the mean of its divisors is an integer number (557334022476).

Almost surely, 2^{21003001199999} is an apocalyptic number.

21003001199999 is a deficient number, since it is larger than the sum of its proper divisors (5749031878849).

21003001199999 is a wasteful number, since it uses less digits than its factorization.

21003001199999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165344 (or 2165337 counting only the distinct ones).

The product of its (nonzero) digits is 354294, while the sum is 53.

The spelling of 21003001199999 in words is "twenty-one trillion, three billion, one million, one hundred ninety-nine thousand, nine hundred ninety-nine".