21001013131003 has 4 divisors (see below), whose sum is σ = 21001028678368. Its totient is φ = 21000997583640.

The previous prime is 21001013130989. The next prime is 21001013131121. The reversal of 21001013131003 is 30013131010012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001013131003 - 2⁵ = 21001013130971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001013131403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5532051 + ... + 8520892.

It is an arithmetic number, because the mean of its divisors is an integer number (5250257169592).

Almost surely, 2^{21001013131003} is an apocalyptic number.

21001013131003 is a deficient number, since it is larger than the sum of its proper divisors (15547365).

21001013131003 is a wasteful number, since it uses less digits than its factorization.

21001013131003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15547364.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21001013131003 its reverse (30013131010012), we get a palindrome (51014144141015).

The spelling of 21001013131003 in words is "twenty-one trillion, one billion, thirteen million, one hundred thirty-one thousand, three".