21343445442 has 96 divisors (see below), whose sum is σ = 51114945024. Its totient is φ = 6382656000.

The previous prime is 21343445437. The next prime is 21343445443. The reversal of 21343445442 is 24454434312.

21343445442 is a `hidden beast` number, since 2 + 134 + 34 + 454 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21343445397 and 21343445406.

It is not an unprimeable number, because it can be changed into a prime (21343445443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6737743 + ... + 6740909.

It is an arithmetic number, because the mean of its divisors is an integer number (532447344).

Almost surely, 2^21343445442 is an apocalyptic number.

21343445442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21343445442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25557472512).

21343445442 is an abundant number, since it is smaller than the sum of its proper divisors (29771499582).

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

21343445442 is a wasteful number, since it uses less digits than its factorization.

21343445442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624 (or 3621 counting only the distinct ones).

The product of its digits is 184320, while the sum is 36.

Adding to 21343445442 its reverse (24454434312), we get a palindrome (45797879754).

The spelling of 21343445442 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-five thousand, four hundred forty-two".