21420323324 has 12 divisors (see below), whose sum is σ = 37535089704. Its totient is φ = 10696011984.

The previous prime is 21420323311. The next prime is 21420323329. The reversal of 21420323324 is 42332302412.

It is a junction number, because it is equal to n+sod(n) for n = 21420323293 and 21420323302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420323329) 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, 3534014 + ... + 3540069.

It is an arithmetic number, because the mean of its divisors is an integer number (3127924142).

Almost surely, 2^21420323324 is an apocalyptic number.

It is an amenable number.

21420323324 is a deficient number, since it is larger than the sum of its proper divisors (16114766380).

21420323324 is a wasteful number, since it uses less digits than its factorization.

21420323324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074844 (or 7074842 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21420323324 its reverse (42332302412), we get a palindrome (63752625736).

The spelling of 21420323324 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-three thousand, three hundred twenty-four".