21131103001 has 4 divisors (see below), whose sum is σ = 21131402292. Its totient is φ = 21130803712.

The previous prime is 21131102989. The next prime is 21131103067. The reversal of 21131103001 is 10030113112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4006763401 + 17124339600 = 63299^2 + 130860^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131103001 - 2¹¹ = 21131100953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131103701) 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, 21525 + ... + 206701.

It is an arithmetic number, because the mean of its divisors is an integer number (5282850573).

Almost surely, 2^21131103001 is an apocalyptic number.

It is an amenable number.

21131103001 is a deficient number, since it is larger than the sum of its proper divisors (299291).

21131103001 is a wasteful number, since it uses less digits than its factorization.

21131103001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299290.

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

Adding to 21131103001 its reverse (10030113112), we get a palindrome (31161216113).

The spelling of 21131103001 in words is "twenty-one billion, one hundred thirty-one million, one hundred three thousand, one".