21612126324 has 12 divisors (see below), whose sum is σ = 50428294784. Its totient is φ = 7204042104.

The previous prime is 21612126317. The next prime is 21612126359. The reversal of 21612126324 is 42362121612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21612126291 and 21612126300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900505252 + ... + 900505275.

Almost surely, 2^21612126324 is an apocalyptic number.

It is an amenable number.

21612126324 is an abundant number, since it is smaller than the sum of its proper divisors (28816168460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21612126324 is a wasteful number, since it uses less digits than its factorization.

21612126324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801010534 (or 1801010532 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

Adding to 21612126324 its reverse (42362121612), we get a palindrome (63974247936).

The spelling of 21612126324 in words is "twenty-one billion, six hundred twelve million, one hundred twenty-six thousand, three hundred twenty-four".