21417213124 has 12 divisors (see below), whose sum is σ = 37844008384. Its totient is φ = 10604639304.

The previous prime is 21417213121. The next prime is 21417213131. The reversal of 21417213124 is 42131271412.

It is a junction number, because it is equal to n+sod(n) for n = 21417213092 and 21417213101.

It is not an unprimeable number, because it can be changed into a prime (21417213121) 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 3 ways as a sum of consecutive naturals, for example, 25991352 + ... + 25992175.

Almost surely, 2^21417213124 is an apocalyptic number.

It is an amenable number.

21417213124 is a deficient number, since it is larger than the sum of its proper divisors (16426795260).

21417213124 is a wasteful number, since it uses less digits than its factorization.

21417213124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51983634 (or 51983632 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

Adding to 21417213124 its reverse (42131271412), we get a palindrome (63548484536).

The spelling of 21417213124 in words is "twenty-one billion, four hundred seventeen million, two hundred thirteen thousand, one hundred twenty-four".