21421330343 has 24 divisors (see below), whose sum is σ = 25396405632. Its totient is φ = 18012489264.

The previous prime is 21421330319. The next prime is 21421330349. The reversal of 21421330343 is 34303312412.

It is not a de Polignac number, because 21421330343 - 2¹² = 21421326247 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 (21421330349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 520196 + ... + 559862.

It is an arithmetic number, because the mean of its divisors is an integer number (1058183568).

Almost surely, 2^21421330343 is an apocalyptic number.

21421330343 is a deficient number, since it is larger than the sum of its proper divisors (3975075289).

21421330343 is a wasteful number, since it uses less digits than its factorization.

21421330343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39891 (or 39884 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21421330343 its reverse (34303312412), we get a palindrome (55724642755).

The spelling of 21421330343 in words is "twenty-one billion, four hundred twenty-one million, three hundred thirty thousand, three hundred forty-three".