21379483 has 2 divisors, whose sum is σ = 21379484. Its totient is φ = 21379482.

The previous prime is 21379481. The next prime is 21379493. The reversal of 21379483 is 38497312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21379483 - 2¹ = 21379481 is a prime.

Together with 21379481, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21379481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10689741 + 10689742.

It is an arithmetic number, because the mean of its divisors is an integer number (10689742).

Almost surely, 2^21379483 is an apocalyptic number.

21379483 is a deficient number, since it is larger than the sum of its proper divisors (1).

21379483 is an equidigital number, since it uses as much as digits as its factorization.

21379483 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 21379483 is about 4623.7953025626. The cubic root of 21379483 is about 277.5443556509.

The spelling of 21379483 in words is "twenty-one million, three hundred seventy-nine thousand, four hundred eighty-three".