21342044205 has 24 divisors (see below), whose sum is σ = 39168929592. Its totient is φ = 10712868864.

The previous prime is 21342044201. The next prime is 21342044231. The reversal of 21342044205 is 50244024312.

21342044205 is a `hidden beast` number, since 2 + 1 + 34 + 204 + 420 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2017986084 + 19324058121 = 44922^2 + 139011^2 .

It is not a de Polignac number, because 21342044205 - 2² = 21342044201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342044201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13948284 + ... + 13949813.

It is an arithmetic number, because the mean of its divisors is an integer number (1632038733).

Almost surely, 2^21342044205 is an apocalyptic number.

It is an amenable number.

21342044205 is a deficient number, since it is larger than the sum of its proper divisors (17826885387).

21342044205 is a wasteful number, since it uses less digits than its factorization.

21342044205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27898125 (or 27898122 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21342044205 its reverse (50244024312), we get a palindrome (71586068517).

The spelling of 21342044205 in words is "twenty-one billion, three hundred forty-two million, forty-four thousand, two hundred five".