21002103311001 has 4 divisors (see below), whose sum is σ = 28002804414672. Its totient is φ = 14001402207332.

The previous prime is 21002103310999. The next prime is 21002103311027. The reversal of 21002103311001 is 10011330120012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21002103311001 - 2¹ = 21002103310999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21002103411001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500350551831 + ... + 3500350551836.

It is an arithmetic number, because the mean of its divisors is an integer number (7000701103668).

Almost surely, 2^{21002103311001} is an apocalyptic number.

It is an amenable number.

21002103311001 is a deficient number, since it is larger than the sum of its proper divisors (7000701103671).

21002103311001 is an equidigital number, since it uses as much as digits as its factorization.

21002103311001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000701103670.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21002103311001 its reverse (10011330120012), we get a palindrome (31013433431013).

The spelling of 21002103311001 in words is "twenty-one trillion, two billion, one hundred three million, three hundred eleven thousand, one".