21342420363 has 16 divisors (see below), whose sum is σ = 32044925952. Its totient is φ = 12517548000.

The previous prime is 21342420361. The next prime is 21342420367. The reversal of 21342420363 is 36302424312.

It is not a de Polignac number, because 21342420363 - 2¹ = 21342420361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21342420363.

It is not an unprimeable number, because it can be changed into a prime (21342420361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10430268 + ... + 10432313.

It is an arithmetic number, because the mean of its divisors is an integer number (2002807872).

Almost surely, 2^21342420363 is an apocalyptic number.

21342420363 is a deficient number, since it is larger than the sum of its proper divisors (10702505589).

21342420363 is a wasteful number, since it uses less digits than its factorization.

21342420363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20862626.

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 21342420363 its reverse (36302424312), we get a palindrome (57644844675).

The spelling of 21342420363 in words is "twenty-one billion, three hundred forty-two million, four hundred twenty thousand, three hundred sixty-three".