21343030477 has 4 divisors (see below), whose sum is σ = 22598502876. Its totient is φ = 20087558080.

The previous prime is 21343030417. The next prime is 21343030519. The reversal of 21343030477 is 77403034312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17711883396 + 3631147081 = 133086^2 + 60259^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343030477 - 2²⁷ = 21208812749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343030417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627736174 + ... + 627736207.

It is an arithmetic number, because the mean of its divisors is an integer number (5649625719).

Almost surely, 2^21343030477 is an apocalyptic number.

It is an amenable number.

21343030477 is a deficient number, since it is larger than the sum of its proper divisors (1255472399).

21343030477 is a wasteful number, since it uses less digits than its factorization.

21343030477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255472398.

The product of its (nonzero) digits is 42336, while the sum is 34.

Adding to 21343030477 its reverse (77403034312), we get a palindrome (98746064789).

The spelling of 21343030477 in words is "twenty-one billion, three hundred forty-three million, thirty thousand, four hundred seventy-seven".