21324442356 has 36 divisors (see below), whose sum is σ = 61603945312. Its totient is φ = 6092697744.

The previous prime is 21324442331. The next prime is 21324442411. The reversal of 21324442356 is 65324442312.

21324442356 is a `hidden beast` number, since 21 + 3 + 244 + 42 + 356 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21324442356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42310150 + ... + 42310653.

Almost surely, 2^21324442356 is an apocalyptic number.

It is an amenable number.

21324442356 is an abundant number, since it is smaller than the sum of its proper divisors (40279502956).

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

21324442356 is a wasteful number, since it uses less digits than its factorization.

21324442356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84620820 (or 84620815 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

Adding to 21324442356 its reverse (65324442312), we get a palindrome (86648884668).

The spelling of 21324442356 in words is "twenty-one billion, three hundred twenty-four million, four hundred forty-two thousand, three hundred fifty-six".