21312132124 has 6 divisors (see below), whose sum is σ = 37296231224. Its totient is φ = 10656066060.

The previous prime is 21312132071. The next prime is 21312132199. The reversal of 21312132124 is 42123121312.

It is a junction number, because it is equal to n+sod(n) for n = 21312132095 and 21312132104.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2664016512 + ... + 2664016519.

Almost surely, 2^21312132124 is an apocalyptic number.

It is an amenable number.

21312132124 is a deficient number, since it is larger than the sum of its proper divisors (15984099100).

21312132124 is a wasteful number, since it uses less digits than its factorization.

21312132124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328033035 (or 5328033033 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

Adding to 21312132124 its reverse (42123121312), we get a palindrome (63435253436).

The spelling of 21312132124 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-two thousand, one hundred twenty-four".