21031123132003 has 4 divisors (see below), whose sum is σ = 21044161647648. Its totient is φ = 21018084616360.

The previous prime is 21031123131979. The next prime is 21031123132027. The reversal of 21031123132003 is 30023132113012.

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

It is an interprime number because it is at equal distance from previous prime (21031123131979) and next prime (21031123132027).

It is a cyclic number.

It is not a de Polignac number, because 21031123132003 - 2⁴¹ = 18832099876451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031123132093) 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, 6519255403 + ... + 6519258628.

It is an arithmetic number, because the mean of its divisors is an integer number (5261040411912).

Almost surely, 2^{21031123132003} is an apocalyptic number.

21031123132003 is a deficient number, since it is larger than the sum of its proper divisors (13038515645).

21031123132003 is a wasteful number, since it uses less digits than its factorization.

21031123132003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13038515644.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21031123132003 its reverse (30023132113012), we get a palindrome (51054255245015).

The spelling of 21031123132003 in words is "twenty-one trillion, thirty-one billion, one hundred twenty-three million, one hundred thirty-two thousand, three".