21343203309 has 8 divisors (see below), whose sum is σ = 28463733760. Its totient is φ = 14225737536.

The previous prime is 21343203307. The next prime is 21343203311. The reversal of 21343203309 is 90330234312.

It is an interprime number because it is at equal distance from previous prime (21343203307) and next prime (21343203311).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21343203309 - 2¹ = 21343203307 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 (21343203307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749869 + ... + 777810.

It is an arithmetic number, because the mean of its divisors is an integer number (3557966720).

Almost surely, 2^21343203309 is an apocalyptic number.

It is an amenable number.

21343203309 is a deficient number, since it is larger than the sum of its proper divisors (7120530451).

21343203309 is a wasteful number, since it uses less digits than its factorization.

21343203309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532339.

The product of its (nonzero) digits is 11664, while the sum is 30.

The spelling of 21343203309 in words is "twenty-one billion, three hundred forty-three million, two hundred three thousand, three hundred nine".