21308477343 has 4 divisors (see below), whose sum is σ = 28411303128. Its totient is φ = 14205651560.

The previous prime is 21308477339. The next prime is 21308477387. The reversal of 21308477343 is 34377480312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21308477343 - 2² = 21308477339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21308477295 and 21308477304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21308477303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551412888 + ... + 3551412893.

It is an arithmetic number, because the mean of its divisors is an integer number (7102825782).

Almost surely, 2^21308477343 is an apocalyptic number.

21308477343 is a deficient number, since it is larger than the sum of its proper divisors (7102825785).

21308477343 is an equidigital number, since it uses as much as digits as its factorization.

21308477343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7102825784.

The product of its (nonzero) digits is 338688, while the sum is 42.

The spelling of 21308477343 in words is "twenty-one billion, three hundred eight million, four hundred seventy-seven thousand, three hundred forty-three".