21001202101003 has 4 divisors (see below), whose sum is σ = 21130043831848. Its totient is φ = 20872360370160.

The previous prime is 21001202100947. The next prime is 21001202101027. The reversal of 21001202101003 is 30010120210012.

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-21001202101003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001202101063) 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, 64420865178 + ... + 64420865503.

It is an arithmetic number, because the mean of its divisors is an integer number (5282510957962).

Almost surely, 2^{21001202101003} is an apocalyptic number.

21001202101003 is a deficient number, since it is larger than the sum of its proper divisors (128841730845).

21001202101003 is a wasteful number, since it uses less digits than its factorization.

21001202101003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128841730844.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21001202101003 its reverse (30010120210012), we get a palindrome (51011322311015).

The spelling of 21001202101003 in words is "twenty-one trillion, one billion, two hundred two million, one hundred one thousand, three".