21343010205 has 16 divisors (see below), whose sum is σ = 37253254464. Its totient is φ = 10348126080.

The previous prime is 21343010189. The next prime is 21343010209. The reversal of 21343010205 is 50201034312.

It is not a de Polignac number, because 21343010205 - 2⁴ = 21343010189 is a prime.

It is a super-2 number, since 2×21343010205² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343010209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64675624 + ... + 64675953.

It is an arithmetic number, because the mean of its divisors is an integer number (2328328404).

Almost surely, 2^21343010205 is an apocalyptic number.

It is an amenable number.

21343010205 is a deficient number, since it is larger than the sum of its proper divisors (15910244259).

21343010205 is a wasteful number, since it uses less digits than its factorization.

21343010205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129351596.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21343010205 its reverse (50201034312), we get a palindrome (71544044517).

The spelling of 21343010205 in words is "twenty-one billion, three hundred forty-three million, ten thousand, two hundred five".