21130224861 has 8 divisors (see below), whose sum is σ = 28176212800. Its totient is φ = 14085526752.

The previous prime is 21130224827. The next prime is 21130224911. The reversal of 21130224861 is 16842203112.

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

It is not a de Polignac number, because 21130224861 - 2¹⁵ = 21130192093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130224461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283561 + ... + 350238.

It is an arithmetic number, because the mean of its divisors is an integer number (3522026600).

Almost surely, 2^21130224861 is an apocalyptic number.

It is an amenable number.

21130224861 is a deficient number, since it is larger than the sum of its proper divisors (7045987939).

21130224861 is a wasteful number, since it uses less digits than its factorization.

21130224861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644915.

The product of its (nonzero) digits is 4608, while the sum is 30.

Adding to 21130224861 its reverse (16842203112), we get a palindrome (37972427973).

The spelling of 21130224861 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-four thousand, eight hundred sixty-one".