21043030631 has 8 divisors (see below), whose sum is σ = 24054819360. Its totient is φ = 18032652288.

The previous prime is 21043030607. The next prime is 21043030637. The reversal of 21043030631 is 13603034012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21043030631 - 2¹⁴ = 21043014247 is a prime.

It is a super-2 number, since 2×21043030631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21043030597 and 21043030606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043030637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320426 + ... + 380471.

It is an arithmetic number, because the mean of its divisors is an integer number (3006852420).

Almost surely, 2^21043030631 is an apocalyptic number.

21043030631 is a deficient number, since it is larger than the sum of its proper divisors (3011788729).

21043030631 is an equidigital number, since it uses as much as digits as its factorization.

21043030631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705193.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21043030631 its reverse (13603034012), we get a palindrome (34646064643).

The spelling of 21043030631 in words is "twenty-one billion, forty-three million, thirty thousand, six hundred thirty-one".