21001120022003 has 4 divisors (see below), whose sum is σ = 22910312751288. Its totient is φ = 19091927292720.

The previous prime is 21001120021993. The next prime is 21001120022009. The reversal of 21001120022003 is 30022002110012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001120022003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001120022009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954596364626 + ... + 954596364647.

It is an arithmetic number, because the mean of its divisors is an integer number (5727578187822).

Almost surely, 2^{21001120022003} is an apocalyptic number.

21001120022003 is a deficient number, since it is larger than the sum of its proper divisors (1909192729285).

21001120022003 is a wasteful number, since it uses less digits than its factorization.

21001120022003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909192729284.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21001120022003 its reverse (30022002110012), we get a palindrome (51023122132015).

The spelling of 21001120022003 in words is "twenty-one trillion, one billion, one hundred twenty million, twenty-two thousand, three".