21113031001 has 4 divisors (see below), whose sum is σ = 21115937232. Its totient is φ = 21110124772.

The previous prime is 21113030959. The next prime is 21113031077. The reversal of 21113031001 is 10013031112.

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 21113031001 - 2¹¹ = 21113028953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113031601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442191 + ... + 1456756.

It is an arithmetic number, because the mean of its divisors is an integer number (5278984308).

Almost surely, 2^21113031001 is an apocalyptic number.

It is an amenable number.

21113031001 is a deficient number, since it is larger than the sum of its proper divisors (2906231).

21113031001 is an equidigital number, since it uses as much as digits as its factorization.

21113031001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906230.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21113031001 its reverse (10013031112), we get a palindrome (31126062113).

The spelling of 21113031001 in words is "twenty-one billion, one hundred thirteen million, thirty-one thousand, one".