21124210463 has 4 divisors (see below), whose sum is σ = 21125616048. Its totient is φ = 21122804880.

The previous prime is 21124210447. The next prime is 21124210511. The reversal of 21124210463 is 36401242112.

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

It is a cyclic number.

It is not a de Polignac number, because 21124210463 - 2⁴ = 21124210447 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 (21124210403) 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, 680003 + ... + 710388.

It is an arithmetic number, because the mean of its divisors is an integer number (5281404012).

Almost surely, 2^21124210463 is an apocalyptic number.

21124210463 is a deficient number, since it is larger than the sum of its proper divisors (1405585).

21124210463 is a wasteful number, since it uses less digits than its factorization.

21124210463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405584.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21124210463 its reverse (36401242112), we get a palindrome (57525452575).

The spelling of 21124210463 in words is "twenty-one billion, one hundred twenty-four million, two hundred ten thousand, four hundred sixty-three".